Good dates seems :
"So it seems that at midnight Saturday the 2nd (= 2011-04-03T00:00:00) it will become 2011-04-03T01:00:00, local time in Morocco. The "fall back" time is ambiguous, though. 24:00 on 30 July and midnight on 31 July are the same time, namely 2011-07-31T00:00:00. Assuming the clocks are changing Saturday night, is it 24:00 _after_ the time change, or before?"