- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
date_default_timezone_set('America/Chicago');
$date = strtotime('2013-12-30 12:00:00 UTC');
$now = strtotime('now');
echo $date;
echo ' ';
echo $now;
echo ' ';
echo date('Y-m-d h:iA', $date);
echo ' ';
echo date('Y-m-d h:iA', $now);