My Mikvah Calendar is a revolutionary new way to help keep a family purity (taharat hamishpacha) calendar according to Chabad Lubavitch custom. Simply enter the date and time of your menstrual flow and let My Mikvah Calendar take care of the rest. My Mikvah Calendar will calculate your times of separation and send you reminders of these upcoming times in the method of your choice. We also offer you the option to learn as you go - offering detailed explanations of how each calculation is reached