The Jewish Calendar בע"ה
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annex
  Gregorian calendar
  Julian calendar
  leap year
  lunation
  new moon
  seasons
  physical quantities
  birthdays
  month names
  history of the calendar
  sample calculation
  public reading
 
birthdays

Since all the years are not the same, some events occur on dates that are not found every year. The phenomenon can be compared, for example, to a birth on February 29th of a Gregorian leap year.

Therefore, there are rules to determine the anniversaries of such events.

Obviously, if the date for the event's anniversary exists in the year of commemoration, there is no need for special rules, and the regular date applies.

Date of birth Bar Mitzva
if the date does not exist
30 Cheshvan 1st Kislev
30 Kislev 1st Tevet
Adar
(regular year)
Adar-II
(embolismic year)
Adar-I
(embolismic year)
Adar
(regular year)
30 Adar-I
(embolismic year)
1st Nissan
(regular year)
Adar-II
(embolismic year)
Adar
(regular year)

Date of death Anniversary
30 Cheshvan If Cheshvan of the year following the death contains 30 days: 1st Kislev.
Otherwise: 29 Cheshvan.
30 Kislev If Kislev of the year following the death contains 30 days: 1st Tevet.
Otherwise: 29 Kislev.
Adar
(regular year)
Ashkenazim : Adar-I ; Sefaradim : Adar-II
(embolismic year)
Adar-I
(embolismic year)
Adar
(regular year)
30 Adar-I
(embolismic year)
30 Shvat
(regular year)
Adar-II
(embolismic year)
Adar
(regular year)

 

Important Notes:

Mourning is taken from the funeral and not from death. But it ends with the anniversary of death.
On the first year after, the recitation of Kaddish ends 11 months after the burial. Adar-I and Adar-II account for one month each.

Use our Anniversary Calculator to help you compute your dates.