Date and Time Related Extensions 2011-11-11T05:02:18-06:00 tag:php.net,2009-10-13:/manual/en/file/refs.calendar PhD PHP Documentation Group Calendar 2011-11-11T05:02:18-06:00 tag:php.net,2009-10-13:/manual/en/book.calendar Date/Time -- Date and Time 2011-11-11T05:02:18-06:00 tag:php.net,2009-10-13:/manual/en/book.datetime