One site says Mohammad was born in 571. 2 others say 570.
Was my guess. Evidently I'm right????
http://www.barkati.net/english/chronology.htm
My calendar gives 571
and omits days of months [if we even know that].
http://www.usc.edu/dept/MSA/fundamentals/prophet/lifeofprophet.html
Birth of mohammed: 4.20.571
My info said 570, but the "important"date I believe is June 10th, regardless of the year. We know how they have a penchant for dates and numbers.