reading time zone on a date

[sfullman]

HI,

I have this javascript on my signin form:

onSubmit="var yom=new Date();document.getElementById('postTime').value=yom;"

postTime will look something like this:

Mon Nov 28 09:14:02 PST 2005

my server is also on PST, but I want to have people log in from anywhere in the world. So someone logging in in Texas would have the above timestamp look like this:

Mon Nov 28 11:14:02 CST 2005

However, it's the same time! My question is, how do I add the TIMEZONE in for strtotime() to read so I can see "absolute" time? This way, I can see if their computer time is a few minutes fast or slow from my (accurate) server time, regardless of where they are.

Many thanks,
Samuel

[Installer]

Here's a stab at it (for PHP > 5.02):

Use the "toUTCString()" method (on a "Date" object) in your javascript and pass it to the server, then:

$tz = date_default_timezone_get();
date_default_timezone_set('UTC');
$time_diff = strtotime('now') - strtotime($_POST['user_utc']);
date_default_timezone_set($tz);