The 24th of March 2011 is 90 days before it and the 20th of September 2011 is 90 days after it.
There are 177 days between December 28 2010 and June 22 2011.
Subtracting 60 days from August 22, 2011 gives June 23, 2011.
Adding 22 days to June 18 gives July 10.
Subtracting 330 days from June 22, 2012 gives July 28, 2011.
Adding 180 days to May 22, 2011 gives November 18, 2011.
June 22, on the solstice the day is at its longest, so it starts getting shorter on 22 June, in the northern hemisphere.
Friday July 22
March 21, 2012
The 11th of July.
Including the start and end dates in the calculation, there are 145 days between the two dates.
3 weeks&1 day. 22 days.
The longest day in any year is the summer solstice. In 2011, this will occur on June 21 in the Northern hemisphere and December 22 in the Southern hemisphere.