February 12, 2011 
Definition:
function get_gmt_from_date($string, $format = 'Y-m-d H:i:s') {}
Returns a date in the GMT equivalent.
Requires and returns a date in the Y-m-d H:i:s format. Simply subtracts the value of the ‘gmt_offset’ option. Return format can be overridden using the $format parameter. The DateTime and DateTimeZone classes are used to respect time zone differences in DST.
Parameters
- string $string: The date to be converted.
- string $format: The format string for the returned date (default is Y-m-d H:i:s)
Return values
returns:GMT version of the date provided.
Source code
function get_gmt_from_date($string, $format = 'Y-m-d H:i:s') {
preg_match('#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches);
$tz = get_option('timezone_string');
if ( $tz ) {
date_default_timezone_set( $tz );
$datetime = new DateTime( $string );
$datetime->setTimezone( new DateTimeZone('UTC') );
$offset = $datetime->getOffset();
$datetime->modify( '+' . $offset / 3600 . ' hours');
$string_gmt = gmdate($format, $datetime->format('U'));
date_default_timezone_set('UTC');
} else {
$string_time = gmmktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]);
$string_gmt = gmdate($format, $string_time - get_option('gmt_offset') * 3600);
}
return $string_gmt;
}
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