The Onah Calculator

You will need a calendar to find your dates and write down the Onot.

Warning: If you do not enter your dates and times correctly,
the calculations will be wrong!

Note: For this calendar, times after midnight but before morning are still considered part of the preceding night- i.e. Monday at 2:00 am is still Sunday night.

Re'iya (when you saw blood):

Date of Re'iya: MonthJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember  Day12345678910111213141516171819202122232425262728293031   2024202520262027
Time:   ampm      before Shekiah  after Shekiah 

I keep the Ohr Zarua onah
I keep the 31st day after the Onah Beinonit

LAST Re'iya

Date of Re'iya: MonthJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember  Day12345678910111213141516171819202122232425262728293031   2024202520262027
before Shekiah  after Shekiah 

---