<?php
date_default_timezone_set('UTC');
$timestamp = mktime(0,0,0,11,1,2014);
var_dump(strtotime('4 thursdays', $timestamp));
var_dump(strtotime('first thursday + 3 weeks', $timestamp));
date_default_timezone_set('America/Chicago');
$timestamp = mktime(0,0,0,11,1,2014);
var_dump(strtotime('4 thursdays', $timestamp));
var_dump(strtotime('first thursday + 3 weeks', $timestamp));
preferences:
58.69 ms | 402 KiB | 5 Q