Compare two dates with JavaScript

Question

Can someone suggest a way to compare the values of two dates greater than  less than  and not in the past using JavaScript  The values will be coming from text boxes

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If you are using   REACT OR REACT NATIVE    use this and it will work  Working like charm   If the two dates are the same  it will return TRUE otherwise FALSE const compareDate    dateVal1  dateVal2    gt            if  dateVal1 valueOf       dateVal2 valueOf                 return true                    else   return false

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from date   10-07-2012           to date    05-05-2012           var fromdate   from date split  -            from date   new Date            from date setFullYear fromdate 2  fromdate 1 -1 fromdate 0            var todate   to date split  -            to date   new Date            to date setFullYear todate 2  todate 1 -1 todate 0            if  from date  gt  to date                          alert  Invalid Date Range  nStart Date cannot be after End Date                 return false              Use this code to compare the date using javascript   Thanks D Jeeva

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Try using this code      var f  date1 split        var t  date2 split        var x  parseInt f 2  f 1  f 0     var y  parseInt t 2  t 1  t 0     if x  gt  y       alert  date1 is after date2       else if x  lt  y       alert  date1 is before date2       else      alert  both date are same

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Try using this code      var f  date1 split        var t  date2 split        var x  parseInt f 2  f 1  f 0     var y  parseInt t 2  t 1  t 0     if x  gt  y       alert  date1 is after date2       else if x  lt  y       alert  date1 is before date2       else      alert  both date are same

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var date today new Date    var formated date   formatDate date today    Calling formatDate Function  var input date  2015 04 22 11 12 AM    var currentDateTime   new Date Date parse formated date    var inputDateTime     new Date Date parse input date     if  inputDateTime  lt   currentDateTime         Do something       function formatDate date        var hours   date getHours        var minutes   date getMinutes        var ampm   hours  gt   12    PM     AM        hours   hours   12      hours   hours   hours   12     the hour  0  should be  12      hours     hours  lt  10    0  hours   hours        minutes   minutes  lt  10    0  minutes   minutes       var strTime   hours     minutes        ampm      return  date getFullYear            date getMonth   1   lt  10    0   date getMonth   1         date getMonth   1             date getDate    lt  10    0  date getDate         date getDate            strTime

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To compare two date we can use date js JavaScript library which can be found at   https   code google com archive p datejs downloads  and use the Date compare  Date date1  Date date2   method and it return a number which mean the following result   -1   date1 is lessthan date2   0   values are equal    1   date1 is greaterthan date2

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Just to add yet another possibility to the many existing options  you could try   if  date1 valueOf    date2 valueOf               which seems to work for me   Of course you do have to ensure that both dates are not undefined     if   date1 date1 valueOf   0    date2 date2 valueOf   0          This way we can ensure that a positive comparison is made if both are undefined also  or     if   date1 date1 valueOf   0    date2 date2 valueOf   -1             if you prefer them not to be equal

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If following is your date format  you can use this code   var first    2012-11-21   var second    2012-11-03   if parseInt first replace  - g     10   gt  parseInt second replace  - g     10                 It will check whether 20121121 number is bigger than 20121103 or not

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Another way to compare two dates  is through the toISOString   method  This is especially useful when comparing to a fixed date kept in a string  since you can avoid creating a short-lived object  By virtue of the ISO 8601 format  you can compare these strings lexicographically  at least when you re using the same timezone    I m not necessarily saying that it s better than using time objects or timestamps  just offering this as another option  There might be edge cases when this could fail  but I haven t stumbled upon them yet

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The Date object will do what you want - construct one for each date  then compare them using the  gt    lt    lt   or  gt      The              and     operators require you to use date getTime   as in   var d1   new Date    var d2   new Date d1   var same   d1 getTime       d2 getTime    var notSame   d1 getTime       d2 getTime      to be clear just checking for equality directly with the date objects won t work  var d1   new Date    var d2   new Date d1    console log d1    d2        prints false  wrong    console log d1     d2       prints false  wrong   console log d1    d2        prints true   wrong   console log d1     d2       prints true   wrong   console log d1 getTime       d2 getTime        prints true  correct    I suggest you use drop-downs or some similar constrained form of date entry rather than text boxes  though  lest you find yourself in input validation hell

User · Answer

Another way to compare two dates  is through the toISOString   method  This is especially useful when comparing to a fixed date kept in a string  since you can avoid creating a short-lived object  By virtue of the ISO 8601 format  you can compare these strings lexicographically  at least when you re using the same timezone    I m not necessarily saying that it s better than using time objects or timestamps  just offering this as another option  There might be edge cases when this could fail  but I haven t stumbled upon them yet

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Compare day only  ignoring time component   Date prototype sameDay   function d      return this getFullYear       d getFullYear        amp  amp  this getDate       d getDate        amp  amp  this getMonth       d getMonth       Usage  if date1 sameDay date2            highlight day on calendar or something else clever     I no longer recommend modifying the prototype of built-in objects  Try this instead   x000D   x000D  function isSameDay d1  d2      return d1 getFullYear       d2 getFullYear    amp  amp      d1 getDate       d2 getDate    amp  amp      d1 getMonth       d2 getMonth        console log isSameDay new Date  Jan 15 2021 02 39 53 GMT-0800    new Date  Jan 15 2021 23 39 53 GMT-0800      console log isSameDay new Date  Jan 15 2021 10 39 53 GMT-0800    new Date  Jan 16 2021 10 39 53 GMT-0800      x000D   x000D   x000D   N B  the year month day will be returned for your timezone  I recommend using a timezone-aware library if you want to check if two dates are on the same day in a different timezone  e g   gt   new Date  Jan 15 2021 01 39 53 Z    getDate       Jan 15 in UTC 14     Returns  quot 14 quot  because I m in GMT-08

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what format   If you construct a Javascript Date object  you can just subtract them to get a milliseconds difference  edit  or just compare them     js gt t1   new Date   Thu Jan 29 2009 14 19 28 GMT-0500  Eastern Standard Time  js gt t2   new Date   Thu Jan 29 2009 14 19 31 GMT-0500  Eastern Standard Time  js gt t2-t1 2672 js gt t3   new Date  2009 Jan 1   Thu Jan 01 2009 00 00 00 GMT-0500  Eastern Standard Time  js gt t1-t3 2470768442 js gt t1 gt t3 true

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To compare two date we can use date js JavaScript library which can be found at   https   code google com archive p datejs downloads  and use the Date compare  Date date1  Date date2   method and it return a number which mean the following result   -1   date1 is lessthan date2   0   values are equal    1   date1 is greaterthan date2

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BEWARE THE TIMEZONE  A javascript date has no notion of timezone  It s a moment in time  ticks since the epoch  with handy functions for translating to and from strings in the  local  timezone  If you want to work with dates using date objects  as everyone here is doing  you want your dates to represent UTC midnight at the start of the date in question  This is a common and necessary convention that lets you work with dates regardless of the season or timezone of their creation  So you need to be very vigilant to manage the notion of timezone  particularly when you create your midnight UTC Date object     Most of the time  you will want your date to reflect the timezone of the user  Click if today is your birthday  Users in NZ and US click at the same time and get different dates  In that case  do this        create a date  utc midnight  reflecting the value of myDate and the environment s timezone offset  new Date Date UTC myDate getFullYear   myDate getMonth    myDate getDate        Sometimes  international comparability trumps local accuracy  In that case  do this        the date in London of a moment in time  Device timezone is ignored  new Date Date UTC myDate getUTCYear    myDate getyUTCMonth    myDate getUTCDate        Now you can directly compare your date objects as the other answers suggest   Having taken care to manage timezone when you create  you also need to be sure to keep timezone out when you convert back to a string representation  So you can safely use      toISOString   getUTCxxx   getTime     returns a number with no time or timezone   toLocaleDateString  fr   timezone  UTC       whatever locale you want  but ALWAYS UTC    And totally avoid everything else  especially      getYear   getMonth   getDate

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SHORT ANSWER  Here is a function that return  boolean  if the from dateTime   to dateTime Demo in action  var from    08 19 2013 00 00  var to    08 12 2013 00 00    function isFromBiggerThanTo dtmfrom  dtmto      return new Date dtmfrom  getTime    gt    new Date dtmto  getTime       console log isFromBiggerThanTo from  to      true   Explanation  jsFiddle   var date one    2013-07-29 01 50 00   date two    2013-07-29 02 50 00     getTime   returns the number of milliseconds since 01 01 1970  var timeStamp date one   new Date date one  getTime       1375077000000  console log typeof timeStamp date one    number  var timeStamp date two   new Date date two  getTime      1375080600000  console log typeof timeStamp date two    number    since you are now having both datetime in number type you can compare them with any Comparison operations         lt                      AND  lt      Then  if you are familiar with C  Custom Date and Time Format String this library should do the exact same thing and help you format your date and time dtmFRM whether you are passing in date time string or unix format   Usage  var myDateTime   new dtmFRM     alert myDateTime ToString 1375077000000   MM dd yyyy hh mm ss ampm       07 29 2013 01 50 00 AM  alert myDateTime ToString 1375077000000  the year is yyyy and the day is dddd       this year is 2013 and the day is Monday  alert myDateTime ToString  1 21 2014    this month is MMMM and the day is dd       this month is january and the day is 21   DEMO  all you have to do is passing any of these format pacified in the library js file

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Performance  Today 2020 02 27 I perform tests of chosen solutions on Chrome v80 0  Safari v13 0 5 and Firefox 73 0 1 on MacOs High Sierra v10 13 6   Conclusions   solutions d1  d2  D  and d1   d2  E  are fastest for all browsers solution getTime  A  is faster than  valueOf  B   both are medium fast  solutions F L N are slowest for all browsers     Details  In below snippet solutions used in performance tests are presented  You can perform test in you machine HERE   x000D   x000D  function A d1 d2    x000D   return d1 getTime      d2 getTime    x000D    x000D   x000D  function B d1 d2    x000D   return d1 valueOf      d2 valueOf    x000D    x000D   x000D  function C d1 d2    x000D   return Number d1       Number d2   x000D    x000D   x000D  function D d1 d2    x000D   return d1    d2  x000D    x000D   x000D  function E d1 d2    x000D   return d1     d2  x000D    x000D   x000D  function F d1 d2    x000D   return    d1 gt d2    d2 gt d1    x000D    x000D   x000D  function G d1 d2    x000D   return d1 1    d2 1  x000D    x000D   x000D  function H d1 d2    x000D   return  d1     d2  x000D    x000D   x000D  function I d1 d2    x000D   return    d1 -  d2   x000D    x000D   x000D  function J d1 d2    x000D   return   d1 - d2   x000D    x000D   x000D  function K d1 d2    x000D   return d1 - d2    0  x000D    x000D   x000D  function L d1 d2    x000D   return    d1 gt d2 - d1 lt d2    x000D    x000D   x000D  function M d1 d2    x000D    return d1 getFullYear       d2 getFullYear   x000D       amp  amp  d1 getDate       d2 getDate   x000D       amp  amp  d1 getMonth       d2 getMonth    x000D    x000D   x000D  function N d1 d2    x000D   return  isFinite d1 valueOf     amp  amp  isFinite d2 valueOf         d1 gt d2 - d1 lt d2     false    x000D    x000D   x000D   x000D     TEST x000D   x000D  let past  new Date  2002-12-24       past x000D  let now  new Date  2020-02-26        now x000D   x000D  console log  Code  d1 gt d2  d1 lt d2  d1 d2   x000D  var log    l f    gt  console log    l        f now past      f past now      f now now      x000D   x000D  log  A  A   x000D  log  B  B   x000D  log  C  C   x000D  log  D  D   x000D  log  E  E   x000D  log  G  G   x000D  log  H  H   x000D  log  I  I   x000D  log  J  J   x000D  log  K  K   x000D  log  L  L   x000D  log  M  M   x000D  log  N  N   x000D  p  color  red  x000D   lt p gt This snippet only presents tested solutions  it not perform tests itself  lt  p gt  x000D   x000D   x000D    Results for chrome

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By far the easiest method is to subtract one date from the other and compare the result    x000D   x000D  var oDateOne   new Date    x000D  var oDateTwo   new Date    x000D   x000D  alert oDateOne - oDateTwo     0   x000D  alert oDateOne - oDateTwo  lt  0   x000D  alert oDateOne - oDateTwo  gt  0   x000D   x000D   x000D

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You can date compare as most simple and understandable way like    lt input type  date  id  getdate1    gt   lt input type  date  id  getdate2    gt    let suppose you have two date input you want to compare them   so firstly write a common method to parse date     lt script type  text javascript  gt              function parseDate input                 var datecomp  input split         if date format 21 09 2017                var tparts timecomp split        if time also giving               return new Date dparts 2   dparts 1 -1  dparts 0   tparts 0   tparts 1       here new date   year  month  date                          lt  script gt    parseDate   is the make common method for parsing the date   now you can checks your date        lt  any type of compare       lt script type  text javascript  gt                   document  ready function                    parseDate pass in this method date                       Var Date1 parseDate     getdate1   val                             Var Date2 parseDate     getdate2   val                      use any oe  lt  or  gt  or   as per ur requirment                 if Date1   Date2            return false     or your code                lt  script gt    For Sure this code will help you

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you use this code      var firstValue    2012-05-12  split  -    var secondValue    2014-07-12  split  -      var firstDate new Date     firstDate setFullYear firstValue 0   firstValue 1  - 1   firstValue 2      var secondDate new Date     secondDate setFullYear secondValue 0   secondValue 1  - 1   secondValue 2            if  firstDate  gt  secondDate         alert  First Date  is greater than Second Date         else         alert  Second Date  is greater than First Date          And also check this link http   www w3schools com js js obj date asp

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var date   new Date       will give you todays date      following calls  will let you set new dates  setDate      setFullYear      setHours     setMilliseconds      setMinutes       setMonth     setSeconds       setTime    var yesterday   new Date    yesterday setDate    date info here    if date gt yesterday      will compare dates

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The simple way is   var first    2012-11-21   var second    2012-11-03    if  new Date first   gt  new Date second

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what format   If you construct a Javascript Date object  you can just subtract them to get a milliseconds difference  edit  or just compare them     js gt t1   new Date   Thu Jan 29 2009 14 19 28 GMT-0500  Eastern Standard Time  js gt t2   new Date   Thu Jan 29 2009 14 19 31 GMT-0500  Eastern Standard Time  js gt t2-t1 2672 js gt t3   new Date  2009 Jan 1   Thu Jan 01 2009 00 00 00 GMT-0500  Eastern Standard Time  js gt t1-t3 2470768442 js gt t1 gt t3 true

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Here is what I did in one of my projects   function CompareDate tform        var startDate   new Date document getElementById  START DATE   value substring 0 10         var endDate   new Date document getElementById  END DATE   value substring 0 10          if tform START DATE value                var estStartDate   tform START DATE value             format for Oracle          tform START DATE value   estStartDate     00 00 00                if tform END DATE value                var estEndDate   tform END DATE value             format for Oracle          tform END DATE value   estEndDate     00 00 00                if endDate  lt   startDate            alert  End date cannot be smaller than or equal to Start date  please review you selection              tform START DATE value   document getElementById  START DATE   value substring 0 10            tform END DATE value   document getElementById  END DATE   value substring 0 10            return false             calling this on form onsubmit  hope this helps

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The relational operators  lt   lt    gt   gt   can be used to compare JavaScript dates   var d1   new Date 2013  0  1   var d2   new Date 2013  0  2   d1  lt   d2     true d1  lt   d2     true d1  gt   d2     false d1  gt   d2     false   However  the equality operators               cannot be used to compare  the value of  dates because         Two distinct objects are never equal for either strict or abstract comparisons    An expression comparing Objects is only true if the operands reference the same Object       You can compare the value of dates for equality using any of these methods   var d1   new Date 2013  0  1   var d2   new Date 2013  0  1         note  d1    d2 returns false as described above     d1 getTime      d2 getTime       true d1 valueOf      d2 valueOf       true Number d1       Number d2        true  d1              d2              true   Both Date getTime   and Date valueOf   return the number of milliseconds since January 1  1970  00 00 UTC  Both Number function and unary   operator call the valueOf   methods behind the scenes

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from date   10-07-2012           to date    05-05-2012           var fromdate   from date split  -            from date   new Date            from date setFullYear fromdate 2  fromdate 1 -1 fromdate 0            var todate   to date split  -            to date   new Date            to date setFullYear todate 2  todate 1 -1 todate 0            if  from date  gt  to date                          alert  Invalid Date Range  nStart Date cannot be after End Date                 return false              Use this code to compare the date using javascript   Thanks D Jeeva

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Compare day only  ignoring time component   Date prototype sameDay   function d      return this getFullYear       d getFullYear        amp  amp  this getDate       d getDate        amp  amp  this getMonth       d getMonth       Usage  if date1 sameDay date2            highlight day on calendar or something else clever     I no longer recommend modifying the prototype of built-in objects  Try this instead   x000D   x000D  function isSameDay d1  d2      return d1 getFullYear       d2 getFullYear    amp  amp      d1 getDate       d2 getDate    amp  amp      d1 getMonth       d2 getMonth        console log isSameDay new Date  Jan 15 2021 02 39 53 GMT-0800    new Date  Jan 15 2021 23 39 53 GMT-0800      console log isSameDay new Date  Jan 15 2021 10 39 53 GMT-0800    new Date  Jan 16 2021 10 39 53 GMT-0800      x000D   x000D   x000D   N B  the year month day will be returned for your timezone  I recommend using a timezone-aware library if you want to check if two dates are on the same day in a different timezone  e g   gt   new Date  Jan 15 2021 01 39 53 Z    getDate       Jan 15 in UTC 14     Returns  quot 14 quot  because I m in GMT-08

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Just to add yet another possibility to the many existing options  you could try   if  date1 valueOf    date2 valueOf               which seems to work for me   Of course you do have to ensure that both dates are not undefined     if   date1 date1 valueOf   0    date2 date2 valueOf   0          This way we can ensure that a positive comparison is made if both are undefined also  or     if   date1 date1 valueOf   0    date2 date2 valueOf   -1             if you prefer them not to be equal

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You can date compare as most simple and understandable way like    lt input type  date  id  getdate1    gt   lt input type  date  id  getdate2    gt    let suppose you have two date input you want to compare them   so firstly write a common method to parse date     lt script type  text javascript  gt              function parseDate input                 var datecomp  input split         if date format 21 09 2017                var tparts timecomp split        if time also giving               return new Date dparts 2   dparts 1 -1  dparts 0   tparts 0   tparts 1       here new date   year  month  date                          lt  script gt    parseDate   is the make common method for parsing the date   now you can checks your date        lt  any type of compare       lt script type  text javascript  gt                   document  ready function                    parseDate pass in this method date                       Var Date1 parseDate     getdate1   val                             Var Date2 parseDate     getdate2   val                      use any oe  lt  or  gt  or   as per ur requirment                 if Date1   Date2            return false     or your code                lt  script gt    For Sure this code will help you

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Dates comparison   var str1    document getElementById  Fromdate   value  var str2    document getElementById  Todate   value  var dt1     parseInt str1 substring 0 2  10    var mon1    parseInt str1 substring 3 5  10   var yr1     parseInt str1 substring 6 10  10    var dt2     parseInt str2 substring 0 2  10    var mon2    parseInt str2 substring 3 5  10    var yr2     parseInt str2 substring 6 10  10    var date1   new Date yr1  mon1  dt1    var date2   new Date yr2  mon2  dt2     if date2  lt  date1       alert  To date cannot be greater than from date       return false      else        alert  Submitting           document form1 submit

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Performance  Today 2020 02 27 I perform tests of chosen solutions on Chrome v80 0  Safari v13 0 5 and Firefox 73 0 1 on MacOs High Sierra v10 13 6   Conclusions   solutions d1  d2  D  and d1   d2  E  are fastest for all browsers solution getTime  A  is faster than  valueOf  B   both are medium fast  solutions F L N are slowest for all browsers     Details  In below snippet solutions used in performance tests are presented  You can perform test in you machine HERE   x000D   x000D  function A d1 d2    x000D   return d1 getTime      d2 getTime    x000D    x000D   x000D  function B d1 d2    x000D   return d1 valueOf      d2 valueOf    x000D    x000D   x000D  function C d1 d2    x000D   return Number d1       Number d2   x000D    x000D   x000D  function D d1 d2    x000D   return d1    d2  x000D    x000D   x000D  function E d1 d2    x000D   return d1     d2  x000D    x000D   x000D  function F d1 d2    x000D   return    d1 gt d2    d2 gt d1    x000D    x000D   x000D  function G d1 d2    x000D   return d1 1    d2 1  x000D    x000D   x000D  function H d1 d2    x000D   return  d1     d2  x000D    x000D   x000D  function I d1 d2    x000D   return    d1 -  d2   x000D    x000D   x000D  function J d1 d2    x000D   return   d1 - d2   x000D    x000D   x000D  function K d1 d2    x000D   return d1 - d2    0  x000D    x000D   x000D  function L d1 d2    x000D   return    d1 gt d2 - d1 lt d2    x000D    x000D   x000D  function M d1 d2    x000D    return d1 getFullYear       d2 getFullYear   x000D       amp  amp  d1 getDate       d2 getDate   x000D       amp  amp  d1 getMonth       d2 getMonth    x000D    x000D   x000D  function N d1 d2    x000D   return  isFinite d1 valueOf     amp  amp  isFinite d2 valueOf         d1 gt d2 - d1 lt d2     false    x000D    x000D   x000D   x000D     TEST x000D   x000D  let past  new Date  2002-12-24       past x000D  let now  new Date  2020-02-26        now x000D   x000D  console log  Code  d1 gt d2  d1 lt d2  d1 d2   x000D  var log    l f    gt  console log    l        f now past      f past now      f now now      x000D   x000D  log  A  A   x000D  log  B  B   x000D  log  C  C   x000D  log  D  D   x000D  log  E  E   x000D  log  G  G   x000D  log  H  H   x000D  log  I  I   x000D  log  J  J   x000D  log  K  K   x000D  log  L  L   x000D  log  M  M   x000D  log  N  N   x000D  p  color  red  x000D   lt p gt This snippet only presents tested solutions  it not perform tests itself  lt  p gt  x000D   x000D   x000D    Results for chrome

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In order to create dates from free text in Javascript you need to parse it into the Date   object   You could use Date parse   which takes free text tries to convert it into a new date but if you have control over the page I would recommend using HTML select boxes instead or a date picker such as the YUI calendar control or the jQuery UI Datepicker   Once you have a date as other people have pointed out you can use simple arithmetic to subtract the dates and convert it back into a number of days by dividing the number  in seconds  by the number of seconds in a day  60 60 24   86400

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Let s suppose that you deal with this 2014  -   06  -   06 or this 06  -   06  -   2014 date format  then you may compare dates this way   var a    2014 06 07   b    2014-06 07   c    07-06 2014   d    07 06 2014    parseInt a replace     s    -  g          parseInt b replace     s    -  g           true parseInt c replace     s    -  g          parseInt d replace     s    -  g           true parseInt a replace     s    -  g        lt  parseInt b replace     s    -  g           false parseInt c replace     s    -  g        gt  parseInt d replace     s    -  g           false   As you can see  we strip separator s  and then compare integers

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If you are using   REACT OR REACT NATIVE    use this and it will work  Working like charm   If the two dates are the same  it will return TRUE otherwise FALSE const compareDate    dateVal1  dateVal2    gt            if  dateVal1 valueOf       dateVal2 valueOf                 return true                    else   return false

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The Date object will do what you want - construct one for each date  then compare them using the  gt    lt    lt   or  gt      The              and     operators require you to use date getTime   as in   var d1   new Date    var d2   new Date d1   var same   d1 getTime       d2 getTime    var notSame   d1 getTime       d2 getTime      to be clear just checking for equality directly with the date objects won t work  var d1   new Date    var d2   new Date d1    console log d1    d2        prints false  wrong    console log d1     d2       prints false  wrong   console log d1    d2        prints true   wrong   console log d1     d2       prints true   wrong   console log d1 getTime       d2 getTime        prints true  correct    I suggest you use drop-downs or some similar constrained form of date entry rather than text boxes  though  lest you find yourself in input validation hell

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Say you got the date objects A and B  get their EPOC time value  then subtract to get the difference in milliseconds   var diff    A -  B    That s all

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var date today new Date    var formated date   formatDate date today    Calling formatDate Function  var input date  2015 04 22 11 12 AM    var currentDateTime   new Date Date parse formated date    var inputDateTime     new Date Date parse input date     if  inputDateTime  lt   currentDateTime         Do something       function formatDate date        var hours   date getHours        var minutes   date getMinutes        var ampm   hours  gt   12    PM     AM        hours   hours   12      hours   hours   hours   12     the hour  0  should be  12      hours     hours  lt  10    0  hours   hours        minutes   minutes  lt  10    0  minutes   minutes       var strTime   hours     minutes        ampm      return  date getFullYear            date getMonth   1   lt  10    0   date getMonth   1         date getMonth   1             date getDate    lt  10    0  date getDate         date getDate            strTime

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I usually store Dates as timestamps Number  in databases  When I need to compare  I simply compare among those timestamps or convert it to Date Object and then compare with  gt   lt if necessary  Note that    or     does not work properly unless your variables are references of the same Date Object  Convert those Date objects to timestamp number  first and then compare equality of them   Date to Timestamp var timestamp 1970   new Date 0  getTime       1970-01-01 00 00 00 var timestamp   new Date   getTime       Current Timestamp  Timestamp to Date var timestamp   0     1970-01-01 00 00 00 var DateObject   new Date timestamp

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The relational operators  lt   lt    gt   gt   can be used to compare JavaScript dates   var d1   new Date 2013  0  1   var d2   new Date 2013  0  2   d1  lt   d2     true d1  lt   d2     true d1  gt   d2     false d1  gt   d2     false   However  the equality operators               cannot be used to compare  the value of  dates because         Two distinct objects are never equal for either strict or abstract comparisons    An expression comparing Objects is only true if the operands reference the same Object       You can compare the value of dates for equality using any of these methods   var d1   new Date 2013  0  1   var d2   new Date 2013  0  1         note  d1    d2 returns false as described above     d1 getTime      d2 getTime       true d1 valueOf      d2 valueOf       true Number d1       Number d2        true  d1              d2              true   Both Date getTime   and Date valueOf   return the number of milliseconds since January 1  1970  00 00 UTC  Both Number function and unary   operator call the valueOf   methods behind the scenes

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I usually store Dates as timestamps Number  in databases  When I need to compare  I simply compare among those timestamps or convert it to Date Object and then compare with  gt   lt if necessary  Note that    or     does not work properly unless your variables are references of the same Date Object  Convert those Date objects to timestamp number  first and then compare equality of them   Date to Timestamp var timestamp 1970   new Date 0  getTime       1970-01-01 00 00 00 var timestamp   new Date   getTime       Current Timestamp  Timestamp to Date var timestamp   0     1970-01-01 00 00 00 var DateObject   new Date timestamp

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In order to create dates from free text in Javascript you need to parse it into the Date   object   You could use Date parse   which takes free text tries to convert it into a new date but if you have control over the page I would recommend using HTML select boxes instead or a date picker such as the YUI calendar control or the jQuery UI Datepicker   Once you have a date as other people have pointed out you can use simple arithmetic to subtract the dates and convert it back into a number of days by dividing the number  in seconds  by the number of seconds in a day  60 60 24   86400

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var curDate new Date    var startDate document forms 0  m strStartDate   var endDate document forms 0  m strEndDate  var startDateVal startDate value split  -    var endDateVal endDate value split  -    var firstDate new Date    firstDate setFullYear startDateVal 2    startDateVal 1  - 1   startDateVal 0     var secondDate new Date    secondDate setFullYear endDateVal 2    endDateVal 1  - 1   endDateVal 0    if firstDate  gt  curDate        alert  Start date cannot be greater than current date         return false    if  firstDate  gt  secondDate        alert  Start date cannot be greater         return false

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Say you got the date objects A and B  get their EPOC time value  then subtract to get the difference in milliseconds   var diff    A -  B    That s all

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Note - Compare Only Date Part   When we compare two date in javascript  It takes hours  minutes and seconds also into consideration   So If we only need to compare date only  this is the approach    var date1  new Date  01 01 2014   setHours 0 0 0 0    var date2  new Date  01 01 2014   setHours 0 0 0 0     Now  if date1 valueOf   gt  date2 valueOf   will work like a charm

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All the above-given answers only solved one thing  compare two dates   Indeed  they seem to be the answers to the question  but a big part is missing    What if I want to check whether a person is fully 18 years old   Unfortunately  NONE of the above-given answers would be able to answer that question    For example  the current time  around the time when I started to type these words  is Fri Jan 31 2020 10 41 04 GMT-0600  Central Standard Time   while a customer enters his Date of Birth as  01 31 2002     If we use  365 days year   which is  31536000000  milliseconds  we would get the following result          let currentTime   new Date           let customerTime   new Date 2002  1  31          let age    currentTime getTime   - customerTime getTime      31536000000        console log  age     age     with the following print-out           age  17 92724710838407   But LEGALLY  that customer is already 18 years old  Even he enters  01 30 2002   the result would still be          age  17 930039743467784   which is less than 18  The system would report the  under age  error   And this would just keep going for  01 29 2002    01 28 2002    01 27 2002       01 05 2002   UNTIL  01 04 2002     A system like that would just kill all the customers who were born between 18 years 0 days and 18 years 26 days ago  because they are legally 18 years old  while the system shows  under age      The following is an answer to a question like that   invalidBirthDate   Invalid date  YEAR cannot be before 1900    invalidAge   Invalid age  AGE cannot be less than 18     public static birthDateValidator control  any   any       const val   control value      if  val    null            const slashSplit   val split  -            if  slashSplit length     3                const customerYear   parseInt slashSplit 0   10               const customerMonth   parseInt slashSplit 1   10               const customerDate   parseInt slashSplit 2   10               if  customerYear  lt  1900                    return   invalidBirthDate  true                  else                   const currentTime   new Date                    const currentYear   currentTime getFullYear                    const currentMonth   currentTime getMonth     1                  const currentDate   currentTime getDate                    if  currentYear - customerYear  lt  18                        return   invalidAge  true                      else if                       currentYear - customerYear     18  amp  amp                      currentMonth - customerMonth  lt  0                        return   invalidAge  true                      else if                       currentYear - customerYear     18  amp  amp                      currentMonth - customerMonth     0  amp  amp                      currentDate - customerDate  lt  0                        return   invalidAge  true                      else                       return null

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var date   new Date       will give you todays date      following calls  will let you set new dates  setDate      setFullYear      setHours     setMilliseconds      setMinutes       setMonth     setSeconds       setTime    var yesterday   new Date    yesterday setDate    date info here    if date gt yesterday      will compare dates

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In order to create dates from free text in Javascript you need to parse it into the Date   object   You could use Date parse   which takes free text tries to convert it into a new date but if you have control over the page I would recommend using HTML select boxes instead or a date picker such as the YUI calendar control or the jQuery UI Datepicker   Once you have a date as other people have pointed out you can use simple arithmetic to subtract the dates and convert it back into a number of days by dividing the number  in seconds  by the number of seconds in a day  60 60 24   86400

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By far the easiest method is to subtract one date from the other and compare the result    x000D   x000D  var oDateOne   new Date    x000D  var oDateTwo   new Date    x000D   x000D  alert oDateOne - oDateTwo     0   x000D  alert oDateOne - oDateTwo  lt  0   x000D  alert oDateOne - oDateTwo  gt  0   x000D   x000D   x000D

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Via Moment js  Jsfiddle  http   jsfiddle net guhokemk 1   function compare dateTimeA  dateTimeB        var momentA   moment dateTimeA  DD MM YYYY        var momentB   moment dateTimeB  DD MM YYYY        if  momentA  gt  momentB  return 1      else if  momentA  lt  momentB  return -1      else return 0     alert compare  11 07 2015    10 07 2015       The method returns 1 if dateTimeA is greater than dateTimeB  The method returns 0 if dateTimeA equals dateTimeB  The method returns -1 if dateTimeA is less than dateTimeB

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Here is what I did in one of my projects   function CompareDate tform        var startDate   new Date document getElementById  START DATE   value substring 0 10         var endDate   new Date document getElementById  END DATE   value substring 0 10          if tform START DATE value                var estStartDate   tform START DATE value             format for Oracle          tform START DATE value   estStartDate     00 00 00                if tform END DATE value                var estEndDate   tform END DATE value             format for Oracle          tform END DATE value   estEndDate     00 00 00                if endDate  lt   startDate            alert  End date cannot be smaller than or equal to Start date  please review you selection              tform START DATE value   document getElementById  START DATE   value substring 0 10            tform END DATE value   document getElementById  END DATE   value substring 0 10            return false             calling this on form onsubmit  hope this helps

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If following is your date format  you can use this code   var first    2012-11-21   var second    2012-11-03   if parseInt first replace  - g     10   gt  parseInt second replace  - g     10                 It will check whether 20121121 number is bigger than 20121103 or not

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The easiest way to compare dates in javascript is to first convert it to a Date object and then compare these date-objects   Below you find an object with three functions    dates compare a b   Returns a number    -1 if a  lt  b 0 if a   b 1 if a  gt  b NaN if a or b is an illegal date  dates inRange  d start end   Returns a boolean or NaN    true if d is between the start and end  inclusive  false if d is before start or after end  NaN if one or more of the dates are illegal   dates convert  Used by the other functions to convert their input to a date object  The input can be   a date-object   The input is returned as is  an array  Interpreted as  year month day   NOTE month is 0-11  a number   Interpreted as number of milliseconds since 1 Jan 1970  a timestamp   a string   Several different formats is supported  like  YYYY MM DD    MM DD YYYY    Jan 31 2009  etc  an object  Interpreted as an object with year  month and date attributes   NOTE month is 0-11           Source  http   stackoverflow com questions 497790 var dates         convert function d               Converts the date in d to a date-object  The input can be               a date object  returned without modification             an array        Interpreted as  year month day   NOTE  month is 0-11               a number       Interpreted as number of milliseconds                             since 1 Jan 1970  a timestamp                a string       Any format supported by the javascript engine  like                              YYYY MM DD    MM DD YYYY    Jan 31 2009  etc              an object       Interpreted as an object with year  month and date                             attributes     NOTE   month is 0-11          return               d constructor     Date   d               d constructor     Array   new Date d 0  d 1  d 2                 d constructor     Number   new Date d                d constructor     String   new Date d                typeof d      object    new Date d year d month d date                NaN                       compare function a b               Compare two dates  could be of any type supported by the convert            function above  and returns              -1   if a  lt  b              0   if a   b              1   if a  gt  b            NaN   if a or b is an illegal date            NOTE  The code inside isFinite does an assignment              return               isFinite a this convert a  valueOf     amp  amp              isFinite b this convert b  valueOf                   a gt b - a lt b                NaN                       inRange function d start end               Checks if date in d is between dates in start and end             Returns a boolean or NaN                true    if d is between start and end  inclusive                false   if d is before start or after end               NaN     if one or more of the dates is illegal             NOTE  The code inside isFinite does an assignment             return               isFinite d this convert d  valueOf     amp  amp              isFinite start this convert start  valueOf     amp  amp              isFinite end this convert end  valueOf                  start  lt   d  amp  amp  d  lt   end               NaN

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The easiest way to compare dates in javascript is to first convert it to a Date object and then compare these date-objects   Below you find an object with three functions    dates compare a b   Returns a number    -1 if a  lt  b 0 if a   b 1 if a  gt  b NaN if a or b is an illegal date  dates inRange  d start end   Returns a boolean or NaN    true if d is between the start and end  inclusive  false if d is before start or after end  NaN if one or more of the dates are illegal   dates convert  Used by the other functions to convert their input to a date object  The input can be   a date-object   The input is returned as is  an array  Interpreted as  year month day   NOTE month is 0-11  a number   Interpreted as number of milliseconds since 1 Jan 1970  a timestamp   a string   Several different formats is supported  like  YYYY MM DD    MM DD YYYY    Jan 31 2009  etc  an object  Interpreted as an object with year  month and date attributes   NOTE month is 0-11           Source  http   stackoverflow com questions 497790 var dates         convert function d               Converts the date in d to a date-object  The input can be               a date object  returned without modification             an array        Interpreted as  year month day   NOTE  month is 0-11               a number       Interpreted as number of milliseconds                             since 1 Jan 1970  a timestamp                a string       Any format supported by the javascript engine  like                              YYYY MM DD    MM DD YYYY    Jan 31 2009  etc              an object       Interpreted as an object with year  month and date                             attributes     NOTE   month is 0-11          return               d constructor     Date   d               d constructor     Array   new Date d 0  d 1  d 2                 d constructor     Number   new Date d                d constructor     String   new Date d                typeof d      object    new Date d year d month d date                NaN                       compare function a b               Compare two dates  could be of any type supported by the convert            function above  and returns              -1   if a  lt  b              0   if a   b              1   if a  gt  b            NaN   if a or b is an illegal date            NOTE  The code inside isFinite does an assignment              return               isFinite a this convert a  valueOf     amp  amp              isFinite b this convert b  valueOf                   a gt b - a lt b                NaN                       inRange function d start end               Checks if date in d is between dates in start and end             Returns a boolean or NaN                true    if d is between start and end  inclusive                false   if d is before start or after end               NaN     if one or more of the dates is illegal             NOTE  The code inside isFinite does an assignment             return               isFinite d this convert d  valueOf     amp  amp              isFinite start this convert start  valueOf     amp  amp              isFinite end this convert end  valueOf                  start  lt   d  amp  amp  d  lt   end               NaN

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BEWARE THE TIMEZONE  A javascript date has no notion of timezone  It s a moment in time  ticks since the epoch  with handy functions for translating to and from strings in the  local  timezone  If you want to work with dates using date objects  as everyone here is doing  you want your dates to represent UTC midnight at the start of the date in question  This is a common and necessary convention that lets you work with dates regardless of the season or timezone of their creation  So you need to be very vigilant to manage the notion of timezone  particularly when you create your midnight UTC Date object     Most of the time  you will want your date to reflect the timezone of the user  Click if today is your birthday  Users in NZ and US click at the same time and get different dates  In that case  do this        create a date  utc midnight  reflecting the value of myDate and the environment s timezone offset  new Date Date UTC myDate getFullYear   myDate getMonth    myDate getDate        Sometimes  international comparability trumps local accuracy  In that case  do this        the date in London of a moment in time  Device timezone is ignored  new Date Date UTC myDate getUTCYear    myDate getyUTCMonth    myDate getUTCDate        Now you can directly compare your date objects as the other answers suggest   Having taken care to manage timezone when you create  you also need to be sure to keep timezone out when you convert back to a string representation  So you can safely use      toISOString   getUTCxxx   getTime     returns a number with no time or timezone   toLocaleDateString  fr   timezone  UTC       whatever locale you want  but ALWAYS UTC    And totally avoid everything else  especially      getYear   getMonth   getDate

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Comparing dates in JavaScript is quite easy    JavaScript has built-in comparison system for dates which makes it so easy to do the comparison     Just follow these steps for comparing 2 dates value  for example you have 2 inputs which each has a Date value in String and you to compare them     1  you have 2 string values you get from an input and you d like to compare them  they are as below   var date1    01 12 2018   var date2    12 12 2018     2  They need to be Date Object to be compared as date values  so simply convert them to date  using new Date    I just re-assign them for simplicity of explanation  but you can do it anyway you like   date1   new Date date1   date2   new Date date2     3  Now simply compare them   using the  gt   lt    gt    lt    date1  gt  date2     false date1  lt  date2     true date1  gt   date2    false date1  lt   date2    true

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Comparing dates in JavaScript is quite easy    JavaScript has built-in comparison system for dates which makes it so easy to do the comparison     Just follow these steps for comparing 2 dates value  for example you have 2 inputs which each has a Date value in String and you to compare them     1  you have 2 string values you get from an input and you d like to compare them  they are as below   var date1    01 12 2018   var date2    12 12 2018     2  They need to be Date Object to be compared as date values  so simply convert them to date  using new Date    I just re-assign them for simplicity of explanation  but you can do it anyway you like   date1   new Date date1   date2   new Date date2     3  Now simply compare them   using the  gt   lt    gt    lt    date1  gt  date2     false date1  lt  date2     true date1  gt   date2    false date1  lt   date2    true

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Via Moment js  Jsfiddle  http   jsfiddle net guhokemk 1   function compare dateTimeA  dateTimeB        var momentA   moment dateTimeA  DD MM YYYY        var momentB   moment dateTimeB  DD MM YYYY        if  momentA  gt  momentB  return 1      else if  momentA  lt  momentB  return -1      else return 0     alert compare  11 07 2015    10 07 2015       The method returns 1 if dateTimeA is greater than dateTimeB  The method returns 0 if dateTimeA equals dateTimeB  The method returns -1 if dateTimeA is less than dateTimeB

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Compare  lt  and  gt  just as usual  but anything involving   should use a   prefix  Like so  var x   new Date  2013-05-23    var y   new Date  2013-05-23        less than  greater than is fine  x  lt  y    gt  false x  gt  y    gt  false x     y    gt  false  oops      anything involving     should use the     prefix    it will then compare the dates  millisecond values  x  lt    y     gt  true  x  gt    y     gt  true  x      y    gt  true

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Hi Here is my code to compare dates   In my case i am doing a check to not allow to select past dates   var myPickupDate    lt pick up date gt    var isPastPickupDateSelected   false  var currentDate   new Date     if currentDate getFullYear    lt   myPickupDate getFullYear         if currentDate getMonth   1  lt   myPickupDate getMonth   1    currentDate getFullYear    lt  myPickupDate getFullYear                             if currentDate getDate    lt   myPickupDate getDate      currentDate getMonth   1  lt  myPickupDate getMonth   1    currentDate getFullYear    lt  myPickupDate getFullYear                                                 isPastPickupDateSelected   false                                              return                                                                    console log  cannot select past pickup date    isPastPickupDateSelected   true

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Note - Compare Only Date Part   When we compare two date in javascript  It takes hours  minutes and seconds also into consideration   So If we only need to compare date only  this is the approach    var date1  new Date  01 01 2014   setHours 0 0 0 0    var date2  new Date  01 01 2014   setHours 0 0 0 0     Now  if date1 valueOf   gt  date2 valueOf   will work like a charm

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you use this code      var firstValue    2012-05-12  split  -    var secondValue    2014-07-12  split  -      var firstDate new Date     firstDate setFullYear firstValue 0   firstValue 1  - 1   firstValue 2      var secondDate new Date     secondDate setFullYear secondValue 0   secondValue 1  - 1   secondValue 2            if  firstDate  gt  secondDate         alert  First Date  is greater than Second Date         else         alert  Second Date  is greater than First Date          And also check this link http   www w3schools com js js obj date asp

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var date   new Date       will give you todays date      following calls  will let you set new dates  setDate      setFullYear      setHours     setMilliseconds      setMinutes       setMonth     setSeconds       setTime    var yesterday   new Date    yesterday setDate    date info here    if date gt yesterday      will compare dates

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Dates comparison   var str1    document getElementById  Fromdate   value  var str2    document getElementById  Todate   value  var dt1     parseInt str1 substring 0 2  10    var mon1    parseInt str1 substring 3 5  10   var yr1     parseInt str1 substring 6 10  10    var dt2     parseInt str2 substring 0 2  10    var mon2    parseInt str2 substring 3 5  10    var yr2     parseInt str2 substring 6 10  10    var date1   new Date yr1  mon1  dt1    var date2   new Date yr2  mon2  dt2     if date2  lt  date1       alert  To date cannot be greater than from date       return false      else        alert  Submitting           document form1 submit

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In order to create dates from free text in Javascript you need to parse it into the Date   object   You could use Date parse   which takes free text tries to convert it into a new date but if you have control over the page I would recommend using HTML select boxes instead or a date picker such as the YUI calendar control or the jQuery UI Datepicker   Once you have a date as other people have pointed out you can use simple arithmetic to subtract the dates and convert it back into a number of days by dividing the number  in seconds  by the number of seconds in a day  60 60 24   86400

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Before comparing the Dates object  try setting both of their milliseconds to zero like Date setMilliseconds 0     In some cases where the Date object is dynamically created in javascript  if you keep printing the Date getTime    you ll see the milliseconds changing  which will prevent the equality of both dates

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The Date object will do what you want - construct one for each date  then compare them using the  gt    lt    lt   or  gt      The              and     operators require you to use date getTime   as in   var d1   new Date    var d2   new Date d1   var same   d1 getTime       d2 getTime    var notSame   d1 getTime       d2 getTime      to be clear just checking for equality directly with the date objects won t work  var d1   new Date    var d2   new Date d1    console log d1    d2        prints false  wrong    console log d1     d2       prints false  wrong   console log d1    d2        prints true   wrong   console log d1     d2       prints true   wrong   console log d1 getTime       d2 getTime        prints true  correct    I suggest you use drop-downs or some similar constrained form of date entry rather than text boxes  though  lest you find yourself in input validation hell

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function datesEqual a  b       return    a gt b    b gt a

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Subtract two date get the difference in millisecond  if you get 0 it s the same date    function areSameDate d1  d2       return d1 - d2     0

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Hi Here is my code to compare dates   In my case i am doing a check to not allow to select past dates   var myPickupDate    lt pick up date gt    var isPastPickupDateSelected   false  var currentDate   new Date     if currentDate getFullYear    lt   myPickupDate getFullYear         if currentDate getMonth   1  lt   myPickupDate getMonth   1    currentDate getFullYear    lt  myPickupDate getFullYear                             if currentDate getDate    lt   myPickupDate getDate      currentDate getMonth   1  lt  myPickupDate getMonth   1    currentDate getFullYear    lt  myPickupDate getFullYear                                                 isPastPickupDateSelected   false                                              return                                                                    console log  cannot select past pickup date    isPastPickupDateSelected   true

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var date   new Date       will give you todays date      following calls  will let you set new dates  setDate      setFullYear      setHours     setMilliseconds      setMinutes       setMonth     setSeconds       setTime    var yesterday   new Date    yesterday setDate    date info here    if date gt yesterday      will compare dates

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SHORT ANSWER  Here is a function that return  boolean  if the from dateTime   to dateTime Demo in action  var from    08 19 2013 00 00  var to    08 12 2013 00 00    function isFromBiggerThanTo dtmfrom  dtmto      return new Date dtmfrom  getTime    gt    new Date dtmto  getTime       console log isFromBiggerThanTo from  to      true   Explanation  jsFiddle   var date one    2013-07-29 01 50 00   date two    2013-07-29 02 50 00     getTime   returns the number of milliseconds since 01 01 1970  var timeStamp date one   new Date date one  getTime       1375077000000  console log typeof timeStamp date one    number  var timeStamp date two   new Date date two  getTime      1375080600000  console log typeof timeStamp date two    number    since you are now having both datetime in number type you can compare them with any Comparison operations         lt                      AND  lt      Then  if you are familiar with C  Custom Date and Time Format String this library should do the exact same thing and help you format your date and time dtmFRM whether you are passing in date time string or unix format   Usage  var myDateTime   new dtmFRM     alert myDateTime ToString 1375077000000   MM dd yyyy hh mm ss ampm       07 29 2013 01 50 00 AM  alert myDateTime ToString 1375077000000  the year is yyyy and the day is dddd       this year is 2013 and the day is Monday  alert myDateTime ToString  1 21 2014    this month is MMMM and the day is dd       this month is january and the day is 21   DEMO  all you have to do is passing any of these format pacified in the library js file

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Subtract two date get the difference in millisecond  if you get 0 it s the same date    function areSameDate d1  d2       return d1 - d2     0

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var curDate new Date    var startDate document forms 0  m strStartDate   var endDate document forms 0  m strEndDate  var startDateVal startDate value split  -    var endDateVal endDate value split  -    var firstDate new Date    firstDate setFullYear startDateVal 2    startDateVal 1  - 1   startDateVal 0     var secondDate new Date    secondDate setFullYear endDateVal 2    endDateVal 1  - 1   endDateVal 0    if firstDate  gt  curDate        alert  Start date cannot be greater than current date         return false    if  firstDate  gt  secondDate        alert  Start date cannot be greater         return false

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try this while compare date should be iso format  yyyy-MM-dd  if you want to compare only dates use this datehelper   lt a href  https   plnkr co edit 9N8ZcC p preview  gt  Live Demo lt  a gt

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Compare  lt  and  gt  just as usual  but anything involving   should use a   prefix  Like so  var x   new Date  2013-05-23    var y   new Date  2013-05-23        less than  greater than is fine  x  lt  y    gt  false x  gt  y    gt  false x     y    gt  false  oops      anything involving     should use the     prefix    it will then compare the dates  millisecond values  x  lt    y     gt  true  x  gt    y     gt  true  x      y    gt  true

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function datesEqual a  b       return    a gt b    b gt a

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An Improved version of the code posted by  some       Compare the current date against another date         param b   Date  the other date     returns   -1   if this  lt  b                0   if this     b                1   if this  gt  b               NaN   if a or b is an illegal date     Date prototype compare   function b      if  b constructor     Date        throw  invalid date         return  isFinite this valueOf     amp  amp  isFinite b valueOf                  this gt b - this lt b    NaN                  usage     var a   new Date 2011  1-1  1     var b   new Date 2011  1-1  1     var c   new Date 2011  1-1  31     var d   new Date 2011  1-1  31      assertEquals  0  a compare b      assertEquals  0  b compare a      assertEquals -1  a compare c      assertEquals  1  c compare a

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The easiest way to compare dates in javascript is to first convert it to a Date object and then compare these date-objects   Below you find an object with three functions    dates compare a b   Returns a number    -1 if a  lt  b 0 if a   b 1 if a  gt  b NaN if a or b is an illegal date  dates inRange  d start end   Returns a boolean or NaN    true if d is between the start and end  inclusive  false if d is before start or after end  NaN if one or more of the dates are illegal   dates convert  Used by the other functions to convert their input to a date object  The input can be   a date-object   The input is returned as is  an array  Interpreted as  year month day   NOTE month is 0-11  a number   Interpreted as number of milliseconds since 1 Jan 1970  a timestamp   a string   Several different formats is supported  like  YYYY MM DD    MM DD YYYY    Jan 31 2009  etc  an object  Interpreted as an object with year  month and date attributes   NOTE month is 0-11           Source  http   stackoverflow com questions 497790 var dates         convert function d               Converts the date in d to a date-object  The input can be               a date object  returned without modification             an array        Interpreted as  year month day   NOTE  month is 0-11               a number       Interpreted as number of milliseconds                             since 1 Jan 1970  a timestamp                a string       Any format supported by the javascript engine  like                              YYYY MM DD    MM DD YYYY    Jan 31 2009  etc              an object       Interpreted as an object with year  month and date                             attributes     NOTE   month is 0-11          return               d constructor     Date   d               d constructor     Array   new Date d 0  d 1  d 2                 d constructor     Number   new Date d                d constructor     String   new Date d                typeof d      object    new Date d year d month d date                NaN                       compare function a b               Compare two dates  could be of any type supported by the convert            function above  and returns              -1   if a  lt  b              0   if a   b              1   if a  gt  b            NaN   if a or b is an illegal date            NOTE  The code inside isFinite does an assignment              return               isFinite a this convert a  valueOf     amp  amp              isFinite b this convert b  valueOf                   a gt b - a lt b                NaN                       inRange function d start end               Checks if date in d is between dates in start and end             Returns a boolean or NaN                true    if d is between start and end  inclusive                false   if d is before start or after end               NaN     if one or more of the dates is illegal             NOTE  The code inside isFinite does an assignment             return               isFinite d this convert d  valueOf     amp  amp              isFinite start this convert start  valueOf     amp  amp              isFinite end this convert end  valueOf                  start  lt   d  amp  amp  d  lt   end               NaN

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Before comparing the Dates object  try setting both of their milliseconds to zero like Date setMilliseconds 0     In some cases where the Date object is dynamically created in javascript  if you keep printing the Date getTime    you ll see the milliseconds changing  which will prevent the equality of both dates

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what format   If you construct a Javascript Date object  you can just subtract them to get a milliseconds difference  edit  or just compare them     js gt t1   new Date   Thu Jan 29 2009 14 19 28 GMT-0500  Eastern Standard Time  js gt t2   new Date   Thu Jan 29 2009 14 19 31 GMT-0500  Eastern Standard Time  js gt t2-t1 2672 js gt t3   new Date  2009 Jan 1   Thu Jan 01 2009 00 00 00 GMT-0500  Eastern Standard Time  js gt t1-t3 2470768442 js gt t1 gt t3 true

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what format   If you construct a Javascript Date object  you can just subtract them to get a milliseconds difference  edit  or just compare them     js gt t1   new Date   Thu Jan 29 2009 14 19 28 GMT-0500  Eastern Standard Time  js gt t2   new Date   Thu Jan 29 2009 14 19 31 GMT-0500  Eastern Standard Time  js gt t2-t1 2672 js gt t3   new Date  2009 Jan 1   Thu Jan 01 2009 00 00 00 GMT-0500  Eastern Standard Time  js gt t1-t3 2470768442 js gt t1 gt t3 true

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The simple way is   var first    2012-11-21   var second    2012-11-03    if  new Date first   gt  new Date second

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The Date object will do what you want - construct one for each date  then compare them using the  gt    lt    lt   or  gt      The              and     operators require you to use date getTime   as in   var d1   new Date    var d2   new Date d1   var same   d1 getTime       d2 getTime    var notSame   d1 getTime       d2 getTime      to be clear just checking for equality directly with the date objects won t work  var d1   new Date    var d2   new Date d1    console log d1    d2        prints false  wrong    console log d1     d2       prints false  wrong   console log d1    d2        prints true   wrong   console log d1     d2       prints true   wrong   console log d1 getTime       d2 getTime        prints true  correct    I suggest you use drop-downs or some similar constrained form of date entry rather than text boxes  though  lest you find yourself in input validation hell

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All the above-given answers only solved one thing  compare two dates   Indeed  they seem to be the answers to the question  but a big part is missing    What if I want to check whether a person is fully 18 years old   Unfortunately  NONE of the above-given answers would be able to answer that question    For example  the current time  around the time when I started to type these words  is Fri Jan 31 2020 10 41 04 GMT-0600  Central Standard Time   while a customer enters his Date of Birth as  01 31 2002     If we use  365 days year   which is  31536000000  milliseconds  we would get the following result          let currentTime   new Date           let customerTime   new Date 2002  1  31          let age    currentTime getTime   - customerTime getTime      31536000000        console log  age     age     with the following print-out           age  17 92724710838407   But LEGALLY  that customer is already 18 years old  Even he enters  01 30 2002   the result would still be          age  17 930039743467784   which is less than 18  The system would report the  under age  error   And this would just keep going for  01 29 2002    01 28 2002    01 27 2002       01 05 2002   UNTIL  01 04 2002     A system like that would just kill all the customers who were born between 18 years 0 days and 18 years 26 days ago  because they are legally 18 years old  while the system shows  under age      The following is an answer to a question like that   invalidBirthDate   Invalid date  YEAR cannot be before 1900    invalidAge   Invalid age  AGE cannot be less than 18     public static birthDateValidator control  any   any       const val   control value      if  val    null            const slashSplit   val split  -            if  slashSplit length     3                const customerYear   parseInt slashSplit 0   10               const customerMonth   parseInt slashSplit 1   10               const customerDate   parseInt slashSplit 2   10               if  customerYear  lt  1900                    return   invalidBirthDate  true                  else                   const currentTime   new Date                    const currentYear   currentTime getFullYear                    const currentMonth   currentTime getMonth     1                  const currentDate   currentTime getDate                    if  currentYear - customerYear  lt  18                        return   invalidAge  true                      else if                       currentYear - customerYear     18  amp  amp                      currentMonth - customerMonth  lt  0                        return   invalidAge  true                      else if                       currentYear - customerYear     18  amp  amp                      currentMonth - customerMonth     0  amp  amp                      currentDate - customerDate  lt  0                        return   invalidAge  true                      else                       return null

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Let s suppose that you deal with this 2014  -   06  -   06 or this 06  -   06  -   2014 date format  then you may compare dates this way   var a    2014 06 07   b    2014-06 07   c    07-06 2014   d    07 06 2014    parseInt a replace     s    -  g          parseInt b replace     s    -  g           true parseInt c replace     s    -  g          parseInt d replace     s    -  g           true parseInt a replace     s    -  g        lt  parseInt b replace     s    -  g           false parseInt c replace     s    -  g        gt  parseInt d replace     s    -  g           false   As you can see  we strip separator s  and then compare integers

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The easiest way to compare dates in javascript is to first convert it to a Date object and then compare these date-objects   Below you find an object with three functions    dates compare a b   Returns a number    -1 if a  lt  b 0 if a   b 1 if a  gt  b NaN if a or b is an illegal date  dates inRange  d start end   Returns a boolean or NaN    true if d is between the start and end  inclusive  false if d is before start or after end  NaN if one or more of the dates are illegal   dates convert  Used by the other functions to convert their input to a date object  The input can be   a date-object   The input is returned as is  an array  Interpreted as  year month day   NOTE month is 0-11  a number   Interpreted as number of milliseconds since 1 Jan 1970  a timestamp   a string   Several different formats is supported  like  YYYY MM DD    MM DD YYYY    Jan 31 2009  etc  an object  Interpreted as an object with year  month and date attributes   NOTE month is 0-11           Source  http   stackoverflow com questions 497790 var dates         convert function d               Converts the date in d to a date-object  The input can be               a date object  returned without modification             an array        Interpreted as  year month day   NOTE  month is 0-11               a number       Interpreted as number of milliseconds                             since 1 Jan 1970  a timestamp                a string       Any format supported by the javascript engine  like                              YYYY MM DD    MM DD YYYY    Jan 31 2009  etc              an object       Interpreted as an object with year  month and date                             attributes     NOTE   month is 0-11          return               d constructor     Date   d               d constructor     Array   new Date d 0  d 1  d 2                 d constructor     Number   new Date d                d constructor     String   new Date d                typeof d      object    new Date d year d month d date                NaN                       compare function a b               Compare two dates  could be of any type supported by the convert            function above  and returns              -1   if a  lt  b              0   if a   b              1   if a  gt  b            NaN   if a or b is an illegal date            NOTE  The code inside isFinite does an assignment              return               isFinite a this convert a  valueOf     amp  amp              isFinite b this convert b  valueOf                   a gt b - a lt b                NaN                       inRange function d start end               Checks if date in d is between dates in start and end             Returns a boolean or NaN                true    if d is between start and end  inclusive                false   if d is before start or after end               NaN     if one or more of the dates is illegal             NOTE  The code inside isFinite does an assignment             return               isFinite d this convert d  valueOf     amp  amp              isFinite start this convert start  valueOf     amp  amp              isFinite end this convert end  valueOf                  start  lt   d  amp  amp  d  lt   end               NaN

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try this while compare date should be iso format  yyyy-MM-dd  if you want to compare only dates use this datehelper   lt a href  https   plnkr co edit 9N8ZcC p preview  gt  Live Demo lt  a gt

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An Improved version of the code posted by  some       Compare the current date against another date         param b   Date  the other date     returns   -1   if this  lt  b                0   if this     b                1   if this  gt  b               NaN   if a or b is an illegal date     Date prototype compare   function b      if  b constructor     Date        throw  invalid date         return  isFinite this valueOf     amp  amp  isFinite b valueOf                  this gt b - this lt b    NaN                  usage     var a   new Date 2011  1-1  1     var b   new Date 2011  1-1  1     var c   new Date 2011  1-1  31     var d   new Date 2011  1-1  31      assertEquals  0  a compare b      assertEquals  0  b compare a      assertEquals -1  a compare c      assertEquals  1  c compare a

[javascript] Compare two dates with JavaScript

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