Ticket #16920: get_gmt_from_date-php5-unittest.php

<?php
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');
        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');
        return $string_gmt;
}

function get_option( $option )
{
        // Fudge get_option() outside of WP paradigm
        return 'America/Chicago';
}

echo get_gmt_from_date('2001-03-01 12:34:56');