Between March 11 and May 21, 1963 there were 10 weeks and 1 day.
8 weeks
18000
Normally there are 25 weeks and 6 days between a 1st of September and a 1st of March. If the March is in a leap year, then there is exactly 26 weeks between the two dates.
From 15 March to 26 April is six weeks.
21 weeks and 6 days
3850 weeks and 6 days
A little over 4 weeks February 8th to March 10 2010.
A little over 74 weeks are between 1st March 2011 and 1st August 2012.
A little over 43 weeks between March 4 2010 and January 5 2011.
24 weeks and 2 days.
41 weeks and 3 days.
21 weeks and 6 days.