AngularJS, Javascript - How to compare two dates that are of mm-yyyy format?

Question

I have two strings in mm-yyyy format (eg: 05-2012) and I need to compare them.

I tried using $filter and Date.parse, but no luck thus far. I don't want to append the string with a dummy 'day' part, unless there is no other way.

Below is my code. Any help would be much appreciated. Thanks.

    var date1= $filter('text')($scope.date1, "mm-yyyy");
    var date2= $filter('text')($scope.date2, "mm-yyyy");
    if (date2 <= date1) {
        $scope.hasInvalidDate = true;
    }

    <input type="text" ng-model="date1" placeholder="mm-yyyy">
    <input type="text" ng-model="date2" placeholder="mm-yyyy">

Split them by "-", reverse, join with "-", compare

MDEV
– MDEV

2014-03-12 17:17:16 +00:00
Commented Mar 12, 2014 at 17:17 — MDEV
– MDEV, Commented Mar 12, 2014 at 17:17
Thanks. will give it a go now.

Ren
– Ren

2014-03-12 17:22:57 +00:00
Commented Mar 12, 2014 at 17:22 — Ren
– Ren, Commented Mar 12, 2014 at 17:22

Community · Accepted Answer · 2017-05-23 10:33:26Z

2

@SmokeyPHP is right, you can do this with JS. See this SO question.

function parseDate(input) {
  var parts = input.split('-');
  // new Date(year, month [, day [, hours[, minutes[, seconds[, ms]]]]])
  return new Date(parts[1], parts[0]-1); // Note: months are 0-based
}

> parseDate("05-2012")
Tue May 01 2012 00:00:00 GMT-0600 (MDT)

And you have the compare part correct.

> d1 = parseDate("05-2012")
Tue May 01 2012 00:00:00 GMT-0600 (MDT)
> d2 = parseDate("06-2012")
Fri Jun 01 2012 00:00:00 GMT-0600 (MDT)
> d1 < d2
true

If you do a lot with dates in JS then moment js is worth looking at. Specifically in this case it has a parse method which can take a format string.

edited May 23, 2017 at 10:33

CommunityBot

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answered Mar 12, 2014 at 17:22

RyanJM

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4 Comments

Ren Over a year ago

Thanks !! All working now. Does new Date() or parseDate take an additional parameter to specify the format of the date string ?

RyanJM Over a year ago

Unfortunately no. If you are going to be doing a lot with dates moment js is a really good library to have around.

Ren Over a year ago

Yeah. I've been just going through its site, and it looks very good.. Thanks for your help..

RyanJM Over a year ago

No problem. In my answer I added a link to the parse method which does what you were talking about.

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