Posted by **Caroline** on Tuesday, March 15, 2011 at 8:31pm.

If there is 31-days in Janurary, and the first day begin on Thursday. How do I determine four weeks and seven days. Do I count the first three days as week one. Followed with the remaining three weeks.

- Math -
**MathMate**, Tuesday, March 15, 2011 at 11:28pm
Four weeks and seven days (=5 weeks) from January first which is a Thursday (see calendar of 2009)

Su Mo Tu We Th Fr Sa

0 0 0 0 1 2 3

4 5 6 7 8 9 10

11 12 13 14 15 16 17

18 19 20 21 22 23 24

25 26 27 28 29 30 31

The first line may be shifted, sorry.

So four weeks finish on the 28th, add three days to finish January, and another four days in February will do the job.

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