Converting a string to a date in JavaScript

Question

How can I convert a string to a date in JavaScript   var st    date in some format  var dt   new date     var dt st    st in date format same as dt

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var st    26 04 2013   var pattern      d 2      d 2      d 4     var dt   new Date st replace pattern   3- 2- 1       And the output will be   dt   gt  Date  Fri Apr 26 2013

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This answer is based on Kassem s answer but it also handles two-digit years  I submitted an edit to Kassem s answer  but in case it wasn t approved  I m also submitting this as a separate answer   function stringToDate  date  format  delimiter            var formatLowerCase  format toLowerCase            var formatItems formatLowerCase split  delimiter           var dateItems  date split  delimiter           var monthIndex formatItems indexOf  mm            var dayIndex formatItems indexOf  dd            var yearIndex formatItems indexOf  yyyy            var year   parseInt dateItems yearIndex                adjust for 2 digit year         if  year  lt  100    year    2000            var month parseInt dateItems monthIndex            month- 1          var formatedDate   new Date year month dateItems dayIndex            return formatedDate     stringToDate  17 9 14   dd MM yyyy        stringToDate  17 9 2014   dd MM yyyy        stringToDate  9 17 2014   mm dd yyyy       stringToDate  9-17-2014   mm-dd-yyyy   -

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Date parse almost gets you what you want   It chokes on the am pm part  but with some hacking you can get it to work   var str    Sun Apr 25  2010 3 30pm       timestamp   timestamp   Date parse str replace   ap m  i         if str match  pm  i   gt   0        timestamp    12   60   60   1000

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use this  code    my problem was solved with this code    function dateDiff date1  date2   var diff                                   Initialisation du retour var tmp   date2 - date1   tmp   Math floor tmp 1000                  Nombre de secondes entre les 2 dates diff sec   tmp   60                        Extraction du nombre de secondes  tmp   Math floor  tmp-diff sec  60         Nombre de minutes  partie enti  re  diff min   tmp   60                        Extraction du nombre de minutes  tmp   Math floor  tmp-diff min  60         Nombre d heures  enti  res  diff hour   tmp   24                       Extraction du nombre d heures  tmp   Math floor  tmp-diff hour  24        Nombre de jours restants diff day   tmp   return diff

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ISO 8601-esque datestrings  as excellent as the standard is  are still not widely supported    This is a great resource to figure out which datestring format you should use    http   dygraphs com date-formats html  Yes  that means that your datestring could be as simple as  as opposed to    2014 10 13 23 57 52  instead of  2014-10-13 23 57 52

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Unfortunately I found out that    x000D   x000D  var mydate   new Date  2014-04-03    x000D  console log mydate toDateString     x000D   x000D   x000D    returns  Wed Apr 02 2014   I know it sounds crazy  but it happens for some users    The bulletproof solution is the following    x000D   x000D  var parts   2014-04-03  split  -    x000D     Please pay attention to the month  parts 1    JavaScript counts months from 0  x000D     January - 0  February - 1  etc  x000D  var mydate   new Date parts 0   parts 1  - 1  parts 2     x000D  console log mydate toDateString     x000D   x000D   x000D

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Timestamps should be casted to a Number  var ts    1471793029764   ts   Number ts      cast it to a Number var date   new Date ts      works  var invalidDate   new Date  1471793029764       does not work  Invalid Date

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You can also do  mydate toLocaleDateString

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For  onverting string to date in js i use http   momentjs com   moment   format  MMMM Do YYYY  h mm ss a       August 16th 2015  4 17 24 pm moment   format  dddd                          Sunday moment   format  MMM Do YY                     Aug 16th 15 moment   format  YYYY  escaped  YYYY           2015 escaped 2015 moment  20111031    YYYYMMDD   fromNow       4 years ago moment  20120620    YYYYMMDD   fromNow       3 years ago moment   startOf  day   fromNow              16 hours ago moment   endOf  day   fromNow                in 8 hours

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If you need to check the contents of the string before converting to Date format      Convert  M D YY  to Date   mdyToDate   function mdy      var d   mdy split      -      3      if  d length    3  return null        Check if date is valid   var mon   parseInt d 0           day   parseInt d 1          year  parseInt d 2      if  d 2  length    2  year    2000    if  day  lt   31  amp  amp  mon  lt   12  amp  amp  year  gt   2015      return new Date year  mon - 1  day      return null

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If you can use the terrific moment library  e g  in an Node js project  you can easily parse your date using e g   var momentDate   moment  2014-09-15 09 00 00      and can access the JS date object via  momentDate    toDate

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The best string format for string parsing is the date ISO format together with the JavaScript Date object constructor    Examples of ISO format  YYYY-MM-DD or YYYY-MM-DDTHH MM SS   But wait   Just using the  ISO format  doesn t work reliably by itself  String are sometimes parsed as UTC and sometimes as localtime  based on browser vendor and version   The best practice should always be to store dates as UTC and make computations as UTC   To parse a date as UTC  append a Z - e g   new Date  2011-04-11T10 20 30Z     To display a date in UTC  use  toUTCString    to display a date in user s local time  use  toString     More info on MDN   Date and this answer   For old Internet Explorer compatibility  IE versions less than 9 do not support ISO format in Date constructor   you should split datetime string representation to it s parts and then you can use constructor using datetime parts  e g    new Date  2011    04  - 1   11    11    51    00    Note that the number of the month must be 1 less     Alternate method - use an appropriate library   You can also take advantage of the library Moment js that allows parsing date with the specified time zone

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Performance Today  2020 05 08  I perform tests for chosen solutions - for two cases  input date is ISO8601 string  Ad Bd Cd Dd Ed  and input date is timestamp  At  Ct  Dt   Solutions Bd Cd Ct not return js Date object as results  but I add them because they can be useful but I not compare them with valid solutions  This results can be useful for massive date parsing  Conclusions  Solution new Date  Ad  is 50-100x faster than moment js  Dd  for all browsers for ISO date and timestamp Solution new Date  Ad  is  10x faster than parseDate  Ed  Solution Date parse Bd  is fastest if wee need to get timestamp from ISO date on all browsers   Details I perform test on MacOs High Sierra 10 13 6 on Chrome 81 0  Safari 13 1  Firefox 75 0  Solution parseDate  Ed  use new Date 0  and manually set UTC date components   x000D   x000D  let ds    2020-05-14T00 00Z      Valid ISO8601 UTC date let ts     1589328000000         timestamp  let Ad   new Date ds   let Bd   Date parse ds   let Cd   moment ds   let Dd   moment ds  toDate    let Ed   parseDate ds    let At   new Date ts   let Ct   moment ts   let Dt   moment ts  toDate     log    n d    gt  console log    n      d    d      console log  from date string    ds  log  Ad   Ad   log  Bd   Bd   log  Cd   Cd   log  Dd   Dd   log  Ed   Ed   console log  from timestamp    ts  log  At   At   log  Ct   Ct   log  Dt   Dt      function parseDate dateStr      let  year month day    dateStr split      0  split  -      let d new Date 0     d setUTCFullYear year     d setUTCMonth month-1     d setUTCDate day    return d    x000D   lt script src  https   cdnjs cloudflare com ajax libs moment js 2 19 1 moment-with-locales min js  gt  lt  script gt   This snippet only presents used soultions   x000D   x000D   x000D   Results for chrome

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You can using regex to parse string to detail time then create date or any return format like      example   let dateString    2018-08-17 01 02 03 4   function strToDate dateString       let reggie      d 4  -  d 2  -  d 2     d 2     d 2     d 2     d 1          year  month  day  hours  minutes  seconds  miliseconds    reggie exec dateString      dateObject   new Date year  month-1  day  hours  minutes  seconds  miliseconds     return dateObject    alert strToDate dateString

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little bit of code for Converting dates                   var dat1   document getElementById  inputDate   value                  var date1   new Date dat1   converts string to date object                 alert date1                   var dat2   document getElementById  inputFinishDate   value                  var date2   new Date dat2                  alert date2

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use this format        get current date in javascript    var currentDate   new Date         for getting a date from a textbox as string format     var newDate document getElementById   lt   textBox1 ClientID  gt    value      convert this date to date time     var MyDate   new Date newDate

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var date   new Date year  month  day     or   var date   new Date  01 01 1970      date string in format  01-01-1970  will not work in FireFox  So better use     instead of  -  in date format string

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x000D   x000D  function dateConvertor date      var options     weekday   long                         year   numeric                         month   short                         day   numeric           var newDateFormat   new Date date  toLocaleDateString  en-US   options       var newTimeFormat   new Date date  toLocaleTimeString         var dateAndTime   newDateFormat        newTimeFormat           return dateAndTime     console log dateConvertor  2021-01-19T18 30 00 000Z     x000D   x000D   x000D

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Yet another way to do it is to build a regex with named capture groups over the format string and then use that regex to extract the day  month and year from the date string    x000D   x000D  function parseDate dateStr  format    x000D    const regex   format toLocaleLowerCase   x000D       replace   bd  b       lt day gt   d     x000D       replace   bm  b       lt month gt   d     x000D       replace   by  b       lt year gt   d     x000D     x000D    const parts   new RegExp regex  exec dateStr         x000D    const   year  month  day     parts groups        x000D    return parts length     4   new Date year  month-1  day    undefined  x000D    x000D   x000D  const printDate   x   gt  console log x   x toLocaleDateString     x   x000D   x000D  printDate parseDate  05 11 1896    dd mm YYYY     x000D  printDate parseDate  07-12-2000    dd-mm-yy     x000D  printDate parseDate  07 12 2000    dd mm yy     x000D  printDate parseDate  2017 6 3    yy MM dd     x000D  printDate parseDate  2017-6-15    y-m-d     x000D  printDate parseDate  2015 6 25    y m d     x000D  printDate parseDate  2015625    y m d        bad format x000D   x000D   x000D

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I have created parseDateTime function to convert the string to date object and it is working in all browser  including IE browser   check if anyone required  reference https   github com Umesh-Markande Parse-String-to-Date-in-all-browser      function parseDateTime datetime                var monthNames                      January    February    March                    April    May    June    July                    August    September    October                    November    December                               if datetime split      length    3                   var date   datetime split      0                   var time   datetime split      1  replace   00                       var timearray   time split                       var hours   parseInt time split      0                    var format   datetime split      2                   var bits   date split   D                    date   new Date bits 0   --bits 1   bits 2       if you change format of datetime which is passed to this function  you need to change bits e x   bits 0   bits 1   bits 2    position as per date  months and year it represent bits array                    var day   date getDate                    var monthIndex   date getMonth                    var year   date getFullYear                    if   format      PM     format      pm    amp  amp  hours     12                        hours    12                      try   time   hours     timearray 1      timearray 2   catch e   time   hours     timearray 1                                       var formateddatetime   new Date monthNames monthIndex          day          year         time                   return formateddatetime               else if datetime split      length    2                   var date   datetime split      0                   var time   datetime split      1                   var bits   date split   D                    var datetimevalue   new Date bits 0   --bits 1   bits 2       if you change format of datetime which is passed to this function  you need to change bits e x   bits 0   bits 1   bits 2    position as per date  months and year it represent bits array                    var day   datetimevalue getDate                    var monthIndex   datetimevalue getMonth                    var year   datetimevalue getFullYear                    var formateddatetime   new Date monthNames monthIndex          day          year         time                   return formateddatetime               else if datetime                         var bits   datetime split   D                    var date   new Date bits 0   --bits 1   bits 2       if you change format of datetime which is passed to this function  you need to change bits e x   bits 0   bits 1   bits 2    position as per date  months and year it represent bits array                    return date                            return datetime                 var date1    2018-05-14 05 04 22 AM        yyyy-mm-dd hh mm ss A     var date2    2018 05 14 05 04 22 AM        yyyy mm dd hh mm ss A     var date3    2018 05 04        yyyy mm dd     var date4    2018-05-04        yyyy-mm-dd     var date5    2018-05-14 15 04 22        yyyy-mm-dd HH mm ss     var date6    2018 05 14 14 04 22        yyyy mm dd HH mm ss      console log parseDateTime date1       console log parseDateTime date2       console log parseDateTime date3       console log parseDateTime date4       console log parseDateTime date5       console log parseDateTime date6      Output---   Mon May 14 2018 05 04 22 GMT 0530  India Standard Time  Mon May 14 2018 05 04 22 GMT 0530  India Standard Time  Fri May 04 2018 00 00 00 GMT 0530  India Standard Time  Fri May 04 2018 00 00 00 GMT 0530  India Standard Time  Mon May 14 2018 15 04 22 GMT 0530  India Standard Time  Mon May 14 2018 14 04 22 GMT 0530  India Standard Time

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I have created a fiddle for this  you can use toDate   function on any date string and provide the date format  This will return you a Date object  https   jsfiddle net Sushil231088 q56yd0rp    17 9 2014  toDate  dd MM yyyy

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Pass it as an argument to Date     var st    date in some format  var dt   new Date st     You can access the date  month  year using  for example  dt getMonth

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If you want to convert from the format  dd MM yyyy   Here is an example   var pattern       d 1 2      d 1 2      d 4      var arrayDate   stringDate match pattern   var dt   new Date arrayDate 3   arrayDate 2  - 1  arrayDate 1      This solution works in IE versions less than 9

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Yet another way to do it   String prototype toDate   function format        format   format     dmy       var separator   this match    0-9    0       var components   this split separator       var day  month  year      for  var key in format            var fmt value   format key           var value   components key           switch  fmt value                case  d                   day   parseInt value                   break              case  m                   month   parseInt value -1                  break              case  y                   year   parseInt value                       return new Date year  month  day      a    3 2 2017   console log a toDate  dmy        Date 2017-02-03T00 00 00 000Z

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I made this function to convert any Date object to a UTC Date object   function dateToUTC date        return new Date date getUTCFullYear    date getUTCMonth    date getUTCDate    date getUTCHours    date getUTCMinutes    date getUTCSeconds         dateToUTC new Date

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Just new Date st    Assuming that it s the proper format

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new Date 2000  10  1  will give you  Wed Nov 01 2000 00 00 00 GMT 0100  CET     See that 0 for month gives you January

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function stringToDate  date  format  delimiter                var formatLowerCase  format toLowerCase                var formatItems formatLowerCase split  delimiter               var dateItems  date split  delimiter               var monthIndex formatItems indexOf  mm                var dayIndex formatItems indexOf  dd                var yearIndex formatItems indexOf  yyyy                var month parseInt dateItems monthIndex                month- 1              var formatedDate   new Date dateItems yearIndex  month dateItems dayIndex                return formatedDate     stringToDate  17 9 2014   dd MM yyyy        stringToDate  9 17 2014   mm dd yyyy       stringToDate  9-17-2014   mm-dd-yyyy   -

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Convert to format pt-BR       var dateString    13 10 2014       var dataSplit   dateString split           var dateConverted       if  dataSplit 2  split      length  gt  1             var hora   dataSplit 2  split      1  split               dataSplit 2    dataSplit 2  split      0           dateConverted   new Date dataSplit 2   dataSplit 1 -1  dataSplit 0   hora 0   hora 1           else           dateConverted   new Date dataSplit 2   dataSplit 1  - 1  dataSplit 0            I hope help somebody

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For those who are looking for a tiny and smart solution   String prototype toDate   function format      var normalized        this replace    a-zA-Z0-9  g   -      var normalizedFormat  format toLowerCase   replace    a-zA-Z0-9  g   -      var formatItems       normalizedFormat split  -      var dateItems         normalized split  -       var monthIndex    formatItems indexOf  mm      var dayIndex      formatItems indexOf  dd      var yearIndex     formatItems indexOf  yyyy      var hourIndex       formatItems indexOf  hh      var minutesIndex    formatItems indexOf  ii      var secondsIndex    formatItems indexOf  ss       var today   new Date       var year    yearIndex gt -1    dateItems yearIndex       today getFullYear      var month   monthIndex gt -1   dateItems monthIndex -1   today getMonth  -1    var day     dayIndex gt -1     dateItems dayIndex        today getDate       var hour      hourIndex gt -1        dateItems hourIndex       today getHours      var minute    minutesIndex gt -1     dateItems minutesIndex    today getMinutes      var second    secondsIndex gt -1     dateItems secondsIndex    today getSeconds       return new Date year month day hour minute second        Example    22 03 2016 14 03 01  toDate  dd mm yyyy hh ii ss     2016-03-29 18 30 00  toDate  yyyy-mm-dd hh ii ss

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x000D   x000D  var a    13 15  x000D  var b   toDate a   h m   x000D    alert b   x000D  document write b   x000D   x000D  function toDate dStr  format    x000D    var now   new Date    x000D    if  format     h m     x000D      now setHours dStr substr 0  dStr indexOf         x000D      now setMinutes dStr substr dStr indexOf        1    x000D      now setSeconds 0   x000D      return now  x000D      else x000D      return  Invalid Format   x000D    x000D   x000D   x000D

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moment js  http   momentjs com   is a complete and good package for use dates and supports ISO 8601 strings   You could add a string date and format   moment  12-25-1995    MM-DD-YYYY      And you could check if a date is valid   moment  not a real date   isValid      Returns false   Some display examples   let dt   moment  02-01-2019    MM-DD-YYYY    console log dt fromNow        dt format  LL        output   3 months ago   February 1  2019    See documentation http   momentjs com docs   parsing string-format      Recommendation  I recommend to use a package for dates that contains a lot of formats because the timezone and format time management is really a big problem  moment js solve a lot of formats  You could parse easily date from a simple string to date but I think that is a hard work to support all formats and variations of dates

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I wrote a reusable function that i use when i get date strings from the server  you can pass your desired delimiter    - etc    that separates the day month and year in order to use the split   method  you can see  amp  test it on this working example    lt  DOCTYPE html gt   lt html gt     lt head gt       lt style gt       lt  style gt     lt  head gt     lt body gt       lt div gt         lt span gt day         lt  span gt          lt span id  day  gt         lt  span gt       lt  div gt       lt div gt         lt span gt month         lt  span gt          lt span id  month  gt         lt  span gt       lt  div gt       lt div gt         lt span gt year         lt  span gt          lt span id  year  gt         lt  span gt       lt  div gt       lt br  gt       lt input type  button  id    value  convert  onClick  convert      28 10 1980     gt       lt span gt 28 10 1980      lt  span gt       lt script gt        function convert delimiter dateString                  var splitted   dateString split                  create a new date from the splitted string          var myDate   new Date splitted 2  splitted 1  splitted 0               now you can access the Date and use its methods          document getElementById  day   innerHTML   myDate getDate            document getElementById  month   innerHTML   myDate getMonth            document getElementById  year   innerHTML   myDate getFullYear                 lt  script gt     lt  body gt   lt  html gt

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You Can try this    x000D   x000D  function formatDate userDOB    x000D    const dob   new Date userDOB   x000D   x000D    const monthNames     x000D       January    February    March    April    May    June    July   x000D        August    September    October    November    December  x000D       x000D   x000D    const day   dob getDate    x000D    const monthIndex   dob getMonth    x000D    const year   dob getFullYear    x000D   x000D       return day         monthNames monthIndex          year  x000D    return    day    monthNames monthIndex     year    x000D    x000D   x000D  console log formatDate  1982-08-10     x000D   x000D   x000D

[javascript] Converting a string to a date in JavaScript

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