Usual number of days in your period:

8 / 2014

MonTueWedThuFriSatSun
        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

9 / 2014

MonTueWedThuFriSatSun
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          

10 / 2014

MonTueWedThuFriSatSun
    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    

Click on a date on the calendar to mark the first day of your last period.

Blue squares show periods saved in your history. Click here if you want to clear the history.