Exactly 11 weeks after December 20, 2011 is March 6, 2012.
Muharram is the first month in an Islamic calendar. As this calendar is a lunar calendar the date changes as compared to the Gregorian calendar. This (2011) year it starts on the 8 December.
March 3 2011 is the date 11 weeks before May 19 2011.
Adding 12 weeks, that is, 84 days, to August 14, 2011, gives November 6, 2011.
calendar date 13 weeks ago
Saturday the 7th of January 2012 is 8 weeks after Saturday the 12th of November 2011. Saturday the 17th of September 2011 is 8 weeks before it.
Thursday December 22, 201151st Week of 2011
As of the date this question was asked, May 4, 2011, subtracting 70 weeks gives December 30, 2009.
December 31.
Hanukkah starts on the Hebrew calendar date of 25 Kislev, and lasts for eight days. Here are the coinciding secular dates for the upcoming years:2011: December 20-282012: December 8-162013: November 27-December 52014: December 16-242015: December 6-14
February 15, 2011
December 21st, 2012.
19 March 2011 on the Gregorian calendar = 6 March 2011 on the Julian calendar