Unix Timestamp conversion for PHP Facebook event

Question

I am using the Facebook PHP SDK to post events to a page on their behalf, but I'm having some problems with the start_time param as I'm pulling the date from a form field. From what I understand this param only accepts an ISO 8601 format date, so I did the following...

The form field displays a date and time as follows (for example): 11/06/2013 08:00PM

To which I convert it to a timestamp in Javascript by doing:

var d = new Date('11/06/2013 08:00PM'),
    eventTimestamp = d.getTime();

Which spits out 1383796800000 - converted back this timestamp in human-readable format is Thu, 07 Nov 2013 04:00:00 GMT (11/6/2013 8:00:00 PM GMT-8 in my timezone...). So far so good!

Now here's where the problem comes in. I use POST to send this timestamp to my script posting the Facebook Event, and then to use it for the param I do this in PHP:

date('c', $_POST['timestamp']);

When I run the script the event that is posted comes out with a date of (as view on the Facebook Event page): Saturday, November 25, 1995.

I hope I described this well enough. Can someone please help me out here?

Edit...

I displayed the data returned by the timestamp in the script, and something interesting happened. Maybe I'm just missing something, but when I echoed $_POST['timestamp'] I got:

1383796800000 (correct)

But when I echoed date('c', $_POST['timestamp']) I got:

1995-11-25T12:18:08-08:00 (very not correct)

What am I missing?

Answer 1

Unless I've over looked something, the date range for date() is "Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT" and your timestamp is higher then this range.

Edit...

You need to divide it by 1000

date('c' $_POST['timestamp']/1000);

which will return 2013-11-06T21:00:00-07:00