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Problem with Javascript Date function in IE 7, returns NaN

Answer 1

A:

You'll want to make sure the date is parsed as UTC, because otherwise javascript will interpret it as a date in your local timezone.

The date looks like this: Tue Jul 13 23:18:36 +0000 2010

You can parse it like this:

function parseDate(str) {
  var v=str.split(' ');
  return new Date(Date.parse(v[1]+" "+v[2]+", "+v[5]+" "+v[3]+" UTC"));
}

Which will give the correct date/time in the local timezone, for example: Tue Jul 13 2010 19:18:36 GMT-0400 (EDT)

So that should leave your code looking something like this:

$(function(){
  $.getJSON("http://twitter.com/statuses/user_timeline/google.json?count=1&amp;callback=?", function(data){
    $.each(data, function(){
      var created = parseDate(this.created_at);
      $("<div></div>").append("<ul><li>Unformatted: " + this.created_at + "</li><li>Formatted: " + created + "</li></ul>").appendTo("body");
    });
  });
  function parseDate(str) {
    var v=str.split(' ');
    return new Date(Date.parse(v[1]+" "+v[2]+", "+v[5]+" "+v[3]+" UTC"));
  } 
});

no 2010-07-14 05:32:26

Thank you. This works great. I'm still learning. So if I understand right. You created a new function called parseDate and passed that the date string and created a new array by splitting it wherever there was a space. Then you reorganized it in the appropriate format.Also, I'm new to this site. So what do I have to do to give you rep points?

superwhatever 2010-07-14 05:48:50

Yep, that's exactly it. Also adding 'UTC' or 'GMT' at the end is important; without that js will assume it's a time in the user's local timezone (it's not, of course; twitter's server doesn't necessarily know what timezone the user is in). You can click the triangle above the `0` beside my answer to +1 me, but i think you need to have created an account to do it. :)

no 2010-07-14 06:04:27

What do you call this format? (Tue Jul 13 23:18:36 +0000 2010)

brad 2010-08-09 18:46:28

@brad - nothing as far as I know... the year is after the timezone; I don't think there are any standardized formats like that. Someone please correct me if I'm wrong, though.

no 2010-08-10 00:20:18

@no I didn't think so, but I wanted to at least attempt to find out. It's a bit weird that twitter uses such a non-standard format. Thanks for the help.

brad 2010-08-10 12:55:45

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Problem with Javascript Date function in IE 7, returns NaN

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