function getTimeStamp($hr, $min, $sec, $mon = false, $day = false, $year = false, $is_gmt = false)
{
$dt = new DateTime();
if ($is_gmt) {
$dt->setTimeZone(new DateTimeZone('UTC'));
}
$dt->setDate($year !== false ? $year : date('Y'), $mon !== false ? $mon : date('m'), $day !== false ? $day : date('d'));
$dt->setTime($hr, $min, $sec);
return (int) $dt->format('U');
}