commit ac631dd580d0e2188b6a38504ca7f5b171f36e31
Author: Derick Rethans <derick@php.net>
Date:   Tue Dec 6 06:21:08 2011 +0000

    - Fixed bug #53502 (strtotime with timezone memory leak).
    - Fixed bug #52062 (large timestamps with DateTime::getTimestamp and
      DateTime::setTimestamp).
    - Fixed bug #51994 (date_parse_from_format is parsing invalid date using 'yz'
      format).
    - Fixed bug #51223 (Seg fault while creating (by unserialization)
      DatePeriod).
