Difference between dates in JavaScript

Question

How to find the difference between two dates

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Date prototype addDays   function days        var dat   new Date this valueOf       dat setDate dat getDate     days      return dat     function getDates startDate  stopDate       var dateArray   new Array      var currentDate   startDate    while  currentDate  lt   stopDate        dateArray push currentDate       currentDate   currentDate addDays 1         return dateArray     var dateArray   getDates new Date     new Date   addDays 7      for  i   0  i  lt  dateArray length  i              alert  dateArray i         date   0  dateArray i  getDate    slice -2       month   0    dateArray i  getMonth   1   slice -2       year dateArray i  getFullYear        alert date  -  month  -  year

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If you are looking for a difference expressed as a combination of years  months  and days  I would suggest this function    x000D   x000D  function interval date1  date2    x000D      if  date1  gt  date2       swap x000D          var result   interval date2  date1   x000D          result years    -result years  x000D          result months   -result months  x000D          result days     -result days  x000D          result hours    -result hours  x000D          return result  x000D        x000D      result     x000D          years   date2 getYear    - date1 getYear    x000D          months  date2 getMonth   - date1 getMonth    x000D          days    date2 getDate    - date1 getDate    x000D          hours   date2 getHours   - date1 getHours   x000D         x000D      if  result hours  lt  0    x000D          result days--  x000D          result hours    24  x000D        x000D      if  result days  lt  0    x000D          result months--  x000D             days   days left in date1 s month   x000D               plus days that have passed in date2 s month x000D          var copy1   new Date date1 getTime     x000D          copy1 setDate 32   x000D          result days   32-date1 getDate  -copy1 getDate   date2 getDate    x000D        x000D      if  result months  lt  0    x000D          result years--  x000D          result months  12  x000D        x000D      return result  x000D    x000D   x000D     Be aware that the month argument is zero-based  January   0  x000D  var date1   new Date 2015  4-1  6   x000D  var date2   new Date 2015  5-1  9   x000D   x000D  document write JSON stringify interval date1  date2     x000D   x000D   x000D    This solution will treat leap years  29 February  and month length differences in a way we would naturally do  I think     So for example  the interval between 28 February 2015 and 28 March 2015 will be considered exactly one month  not 28 days  If both those days are in 2016  the difference will still be exactly one month  not 29 days    Dates with exactly the same month and day  but different year  will always have a difference of an exact number of years  So the difference between 2015-03-01 and 2016-03-01 will be exactly 1 year  not 1 year and 1 day  because of counting 365 days as 1 year

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I have found this and it works fine for me   Calculating the Difference between Two Known Dates  Unfortunately  calculating a date interval such as days  weeks  or months between two known dates is not as easy because you can t just add Date objects together  In order to use a Date object in any sort of calculation  we must first retrieve the Date s internal millisecond value  which is stored as a large integer  The function to do that is Date getTime    Once both Dates have been converted  subtracting the later one from the earlier one returns the difference in milliseconds  The desired interval can then be determined by dividing that number by the corresponding number of milliseconds  For instance  to obtain the number of days for a given number of milliseconds  we would divide by 86 400 000  the number of milliseconds in a day  1000 x 60 seconds x 60 minutes x 24 hours    Date daysBetween   function  date1  date2         Get 1 day in milliseconds   var one day 1000 60 60 24        Convert both dates to milliseconds   var date1 ms   date1 getTime      var date2 ms   date2 getTime          Calculate the difference in milliseconds   var difference ms   date2 ms - date1 ms        Convert back to days and return   return Math round difference ms one day         Set the two dates var y2k    new Date 2000  0  1    var Jan1st2010   new Date y2k getFullYear     10  y2k getMonth    y2k getDate     var today  new Date      displays 726 console log   Days since                 Jan1st2010 toLocaleDateString                        Date daysBetween Jan1st2010  today      The rounding is optional  depending on whether you want partial days or not   Reference

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This is for first date     first   new Date 2010  03  08  15  30  10      Get the first date epoch object     document write  first getTime    1000      get the actual epoch values     second   new Date 2012  03  08  15  30  10      Get the first date epoch object     document write  second getTime    1000      get the actual epoch values     diff  second - first       one day epoch   24 60 60       calculating one epoch     if   diff  one day epoch  gt  365      check   is it exceei           alert   date is exceeding one year

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This answer  based on another one  link at end   is about the difference between two dates  You can see how it works because it s simple  also it includes splitting the difference into units of time  a function that I made  and converting to UTC to stop time zone problems    x000D   x000D  function date units diff a  b  unit amounts    x000D      var split to whole units   function  milliseconds  unit amounts    x000D             unit amounts   list array of amounts of milliseconds in a x000D             second  seconds in a minute  etc   for example   1000  60    x000D          time data    milliseconds   x000D          for  i   0  i  lt  unit amounts length  i      x000D              time data push parseInt time data i    unit amounts i     x000D              time data i    time data i    unit amounts i   x000D             return time data reverse    x000D         if  unit amounts    undefined    x000D          unit amounts    1000  60  60  24   x000D         x000D      var utc a   new Date a toUTCString     x000D      var utc b   new Date b toUTCString     x000D      var diff    utc b - utc a   x000D      return split to whole units diff  unit amounts   x000D    x000D   x000D     Example of use  x000D  var d   date units diff new Date 2010  0  1  0  0  0  0   new Date    slice 0 -2   x000D  document write  In difference  0 days  1 hours  2 minutes   replace  x000D      0 1 2 g  function  x   return String  d Number x           x000D   x000D   x000D    How my code above works  A date time difference  as milliseconds  can be calculated using the Date object   var a   new Date       Current date now  var b   new Date 2010  0  1  0  0  0  0      Start of 2010   var utc a   new Date a toUTCString     var utc b   new Date b toUTCString     var diff    utc b - utc a      The difference as milliseconds    Then to work out the number of seconds in that difference  divide it by 1000 to convert milliseconds to seconds  then change the result to an integer  whole number  to remove the milliseconds  fraction part of that decimal   var seconds   parseInt diff 1000   Also  I could get longer units of time using the same process  for example   -  whole  minutes  dividing seconds by 60 and changing the result to an integer   - hours  dividing minutes by 60 and changing the result to an integer   I created a function for doing that process of splitting the difference into whole units of time  named split to whole units  with this demo   console log split to whole units 72000   1000  60        - gt   1 12 0    1  whole  minute  12 seconds  0 milliseconds    This answer is based on this other one

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By using the Date object and its milliseconds value  differences can be calculated   var a   new Date       Current date now  var b   new Date 2010  0  1  0  0  0  0      Start of 2010  var d    b-a      Difference in milliseconds    You can get the number of seconds  as a integer whole number  by dividing the milliseconds by 1000 to convert it to seconds then converting the result to an integer  this removes the fractional part representing the milliseconds    var seconds   parseInt  b-a  1000     You could then get whole minutes by dividing seconds by 60 and converting it to an integer  then hours by dividing minutes by 60 and converting it to an integer  then longer time units in the same way  From this  a function to get the maximum whole amount of a time unit in the value of a lower unit and the remainder lower unit can be created   function get whole values base value  time fractions        time data    base value       for  i   0  i  lt  time fractions length  i              time data push parseInt time data i  time fractions i             time data i    time data i    time fractions i          return time data        Input parameters below  base value of 72000 milliseconds  time fractions are    1000  amount of milliseconds in a second  and 60  amount of seconds in a minute    console log get whole values 72000   1000  60        - gt   0 12 1    0 whole milliseconds  12 whole seconds  1 whole minute    If you re wondering what the input parameters provided above for the second Date object are  see their names below   new Date  lt year gt    lt month gt    lt day gt    lt hours gt    lt minutes gt    lt seconds gt    lt milliseconds gt      As noted in the comments of this solution  you don t necessarily need to provide all these values unless they re necessary for the date you wish to represent

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var DateDiff   function type  start  end         let    or var         years   end getFullYear   - start getFullYear            monthsStart   start getMonth            monthsEnd   end getMonth              var returns   -1       switch type           case  m   case  mm   case  month   case  months               returns         years   12   -   12 - monthsEnd         12 - monthsStart                  break          case  y   case  yy   case  year   case  years               returns   years              break          case  d   case  dd   case  day   case  days               returns       end - start       1000   60   60   24                  break             return returns          Usage      var qtMonths   DateDiff  mm   new Date  2015-05-05    new Date          var qtYears   DateDiff  yy   new Date  2015-05-05    new Date          var qtDays   DateDiff  dd   new Date  2015-05-05    new Date               OR          var qtMonths   DateDiff  m   new Date  2015-05-05    new Date        m    y    d          var qtMonths   DateDiff  month   new Date  2015-05-05    new Date        month    year    day          var qtMonths   DateDiff  months   new Date  2015-05-05    new Date        months    years    days                   var DateDiff   function  type  start  end         let    or var         years   end getFullYear   - start getFullYear            monthsStart   start getMonth            monthsEnd   end getMonth              if   m    mm    month    months   includes type   ES6            return       years   12   -   12 - monthsEnd         12 - monthsStart          else if   y    yy    year    years   includes type           return years      else if    d    dd    day    days   indexOf type      -1  EARLIER JAVASCRIPT VERSIONS            return     end - start       1000   60   60   24          else         return -1

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You can also use it export function diffDateAndToString small  Date  big  Date             To calculate the time difference of two dates      const Difference In Time   big getTime   - small getTime           To calculate the no  of days between two dates      const Days   Difference In Time    1000   3600   24      const Mins   Difference In Time    60   1000      const Hours   Mins   60      const diffDate   new Date Difference In Time       console log   date  small  now  big  diffDate  Difference In Days  Days  Difference In Mins  Mins  Difference In Hours  Hours         var result           if  Mins  lt  60            result   Mins    m        else if  Hours  lt  24  result   diffDate getMinutes      h      else result   Days    d      return   result  Days  Mins  Hours      results in   result   30d   Days  30  Mins  43200  Hours  720

[javascript] Difference between dates in JavaScript

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