IdeasAnswer
Thank you so much for clearing this up. I was able to remember my mother on the correct date. I have been using your date converter. For some reason the date converter translates all non leap year adar dates to adar II this year. So using the date converter got me a different result this year.
my mother passed away on March 18, 2004 which was not a leap year on the Hebrew calendar. Why is the Hebcal calendar putting her Yahrzeit this year into Adar II. It hasn't done that before. Her Hebrew date of passing was 25 Adar 5764
If your mother passed away on March 18, 2004 then indeed the yahrzeit is observed in Adar I in leap years and Adar during ordinary years.
In fact, this is exactly what the Hebcal Yahrzeit + Anniversary calendar produces:
https://www.hebcal.com/yahrzeit?v=yahrzeit&y1=2004&m1=3&d1=18&t1=Yahrzeit
| Sat, 26 Feb 2022 | Person1's 18th Yahrzeit (25th of Adar I) |
| Sat, 18 Mar 2023 | Person1's 19th Yahrzeit (25th of Adar) |
| Tue, 5 Mar 2024 | Person1's 20th Yahrzeit (25th of Adar I) |
| Tue, 25 Mar 2025 | Person1's 21st Yahrzeit (25th of Adar) |
| Sat, 14 Mar 2026 | Person1's 22nd Yahrzeit (25th of Adar) |
| Thu, 4 Mar 2027 | Person1's 23rd Yahrzeit (25th of Adar I) |
Where are you seeing different results for March 18, 2004?
Hebcal uses the algorithm defined in Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz, which accords with Ashkenazic practice.
The customary anniversary date of a death is more complicated and depends also on the character of the year in which the first anniversary occurs. There are several cases:
- If the date of death is Marcheshvan 30, the anniversary in general depends on the first anniversary; if that first anniversary was not Marcheshvan 30, use the day before Kislev 1.
- If the date of death is Kislev 30, the anniversary in general again depends on the first anniversary — if that was not Kislev 30, use the day before Tevet 1.
- If the date of death is Adar II, the anniversary is the same day in the last month of the Hebrew year (Adar or Adar II).
- If the date of death is Adar I 30, the anniversary in a Hebrew year that is not a leap year (in which Adar only has 29 days) is the last day in Shevat.
- In all other cases, use the normal (that is, same month number) anniversary of the date of death.
[Calendrical Calculations p. 113]
https://www.hebcal.com/home/wp-content/uploads/2022/02/spier-pg7.png
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If your mother passed away on March 18, 2004 then indeed the yahrzeit is observed in Adar I in leap years and Adar during ordinary years.
In fact, this is exactly what the Hebcal Yahrzeit + Anniversary calendar produces:
https://www.hebcal.com/yahrzeit?v=yahrzeit&y1=2004&m1=3&d1=18&t1=Yahrzeit
Where are you seeing different results for March 18, 2004?