5 September, 2004
re. vest haflagah…if you get your period during the day in one month and at night in the next month, do the interval number of days change for the following month?
The most common way to calculate an interval, which is explained in the article on this site, is based on the Hebrew day. Thus for purposes of counting, it does not matter if you got your period during the day or night onah.
The practice in Chabad is to count the number of onot, rather than the number of days. Please get back to us if you follow this custom.
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