<?php
/** Returns the offset from the origin timezone to the remote timezone, in seconds.
* @param $remote_tz;
* @param $origin_tz; If null the servers current timezone is used as the origin.
* @return int;
*/
function get_timezone_offset($remote_tz, $origin_tz = null) {
if($origin_tz === null) {
if(!is_string($origin_tz = date_default_timezone_get())) {
return false; // A UTC timestamp was returned -- bail out!
}
}
$origin_dtz = new DateTimeZone($origin_tz);
$remote_dtz = new DateTimeZone($remote_tz);
$origin_dt = new DateTime("now", $origin_dtz);
$remote_dt = new DateTime("now", $remote_dtz);
$offset = $origin_dtz->getOffset($origin_dt) - $remote_dtz->getOffset($remote_dt);
return $offset;
}
// This will return 10800 (3 hours) ...
$offset = get_timezone_offset('America/Los_Angeles','America/New_York');
// or, if your server time is already set to 'America/New_York'...
$offset = get_timezone_offset('America/Los_Angeles');
// You can then take $offset and adjust your timestamp.
$offset_time = time() + $offset;
?>