Getting timezone for JavaScript and PHP all mixed up

Question

I'm trying to synchronize the timezone between a PHP script and some JavaScript code.

I want a PHP function that returns a timestamp in UTC. Does gmmktime() do that?

On the JavaScript side, I have:

var real_date = new Date(); real_date -= real_date.getTimezoneOffset() * 60000; real_date /= 1000;

Does this convert the timestamp to UTC?

Amber · Accepted Answer · 2010-08-14 18:25:20Z

PHP

Just time() will do what you want. If you want an arbitrary timestamp, instead of the current time, then gmmktime will do that, yes.

Returns the current time measured in the number of seconds since the Unix Epoch (January 1 1970 00:00:00 GMT).

http://www.php.net/manual/en/function.time.php

Javascript

You can use the .UTC() method of a Date object to get # of milliseconds in UTC. However, your current solution should also work, if you're starting with a timestamp.

Thanks. So just to confirm... time() in PHP is timezone-independent?

dierre · Accepted Answer · 2010-08-14 18:35:11Z

0

You can use time()

For the Javascript question UTC

edited Aug 14, 2010 at 18:35

answered Aug 14, 2010 at 18:16

dierre

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2 Comments

dierre Over a year ago

actually gmdate returns the Greenwich Mean Time, I was wrong, I'll edit it.

eyelidlessness Over a year ago

FWIW, unless you're concerned about accuracy down to fractional seconds (and if you are, you probably aren't using PHP), GMT and UTC should be equivalent.

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