[GreenLanternCorps]

The Islamic calendar is a 12 month lunar calendar of 354 or 355 days. So it moves when compared to a Gregorian calendar ten or eleven days a year.

The current Year of the Hijra is 1431. It began on December 18th, 2009 and will end on December 6th, 2010.

http://en.wikipedia.org/wiki/Islamic_calendar

[RachelFaith]

The Islamic calendar is a 12 month lunar calendar of 354 or 355 days

Fitting, of course, since they worshiped the Moon God, known as Al-Allah about 100 years before the birth of Mohamed.