Usual number of days in your period:

7 / 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      

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          

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.