Weeks from August 30 to December 31 2010 is slightly over 17.
30 weeks (rounded down).
There is about 30 weeks in the time span.
30 weeks
From the 30th of April to the 1st of December is 30 weeks and 5 days.
30 weeks and 2 days have passed in 2013 as of the 1st of August, and 21 weeks and 5 days remain in the year.
30 weeks (rounded down)
47 weeks and 5 days.
In 2016, from the Saturday the 30th of April, until the Thursday the 1st of December is 30 weeks and 5 days.
34 weeks and 3 days.
That's about 30 1/2 weeks.
There are 30 weeks and 2 days between those dates
9 weeks and 2 days.