Usual number of days in your period:

12 / 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        

1 / 2015

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  

2 / 2015

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  

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.