Jewish family memory
How is a yahrzeit calculated?
Calculating a yahrzeit begins with the Hebrew date of death, then applies that date to the target Hebrew year. Sunset and calendar edge cases can require more information or a custom-specific decision.
By Pinkas · Updated September 28, 2026
A practical first step
Start from the original date, record the sunset status, and preserve the assumptions used by the calculator. Have uncertain or custom-dependent cases reviewed before treating the result as your family's observance date.
An example to follow
A copied civil anniversary is not enough to reconstruct an observance reliably. Ask the record holder for the place, approximate time, and established family practice.
Keep the record useful for the next relative
Save the original item or recording, the source of each claim, and the date you added the note. Label estimates and disputed details. Decide who should have access before inviting other people to help.