how to compare two string dates in javascript

Question

I have two string dates in the format of m d yyyy  For example     11 1 2012        1 2 2013     I am writing a function in JavaScript to compare two string dates  The signature of my function is  bool isLater string1  string2   if the date passed by string1 is later than the date passed by string2  it will return true  otherwise false  So  isLater    1 2 2013        11 1 2012     should return true  How do I write a JavaScript function for this

User · Answer

If your date is not in format standar yyyy-mm-dd  2017-02-06  for example 20 06 2016  You can use this code  var parts   01 07 2016  val   split       var d1   Number parts 2    parts 1    parts 0    parts   20 06 2016  val   split       var d2   Number parts 2    parts 1    parts 0    return d1  gt  d2

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You can simply compare 2 strings  function isLater dateString1  dateString2      return dateString1  gt  dateString2     Then  isLater  2012-12-01    2012-11-01     returns true while  isLater  2012-12-01    2013-11-01     returns false

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var d1   Date parse  2012-11-01    var d2   Date parse  2012-11-04    if  d1  lt  d2        alert   Error         Demo Jsfiddle

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Directly parsing a date string that is not in yyyy-mm-dd format  like in the accepted answer does not work  The answer by vitran does work but has some JQuery mixed in so I reworked it a bit      Takes two strings as input  format is dd mm yyyy    returns true if d1 is smaller than or equal to d2  function compareDates d1  d2   var parts  d1 split       var d1   Number parts 2    parts 1    parts 0    parts   d2 split       var d2   Number parts 2    parts 1    parts 0    return d1  lt   d2      P S  would have commented directly to vitran s post but  I don t have the rep to do that

User · Answer

Parse the dates and compare them as you would numbers   function isLater str1  str2        return new Date str1   gt  new Date str2       If you need to support other date format consider a library such as date js

User · Answer

You can use  quot Date parse   quot  to properly compare the dates  but since in most of the comments people are trying to split the string and then trying to add up the digits and compare with obviously wrong logic -not completely  Here s the trick  If you are breaking the string then compare the parts in nested format  Compare year with year  month with month and day with day   lt pre gt  lt code gt   var parts1    quot 26 07 2020 quot  split       var parts2    quot 26 07 2020 quot  split        var latest   false   if  parseInt parts1 2    gt  parseInt parts2 2          latest   true    else if  parseInt parts1 2      parseInt parts2 2          if  parseInt parts1 1    gt  parseInt parts2 1              latest   true        else if  parseInt parts1 1      parseInt parts2 1              if  parseInt parts1 0    gt   parseInt parts2 0                  latest   true                      return latest    lt  code gt  lt  pre gt

[javascript] how to compare two string dates in javascript?

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