I don't know for sure, but it is probably not a coincidence that the clocks change in Amman, Jordan on the 28th: http://www.evi.com/q/when_do_the_clocks_change_in_amman_jordan
My suspicion is that the clocks jump from 2013-03-28 21:59:59 to 2013-03-28 23:00:00, so the time 2013-03-28 22:00:00 doesn't exist in the Amman, Jordan time zone.