Hebrew Birthday Calculator
Enter the Hebrew birth date and target Hebrew year. This version calculates Hebrew age and anniversary adjustment rules without pretending to perform a full Gregorian conversion.
- Anniversary Month Number
- 7
- Anniversary Day
- 15
- Adar Review Flag
- 0
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The calculator returns the nominal Hebrew age, selected anniversary month code, and selected day. Verify the result with a dedicated Hebrew calendar converter, especially for Adar and dates near sunset.
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How to Use This Calculator
Enter the Hebrew birth year, month number, day, and target Hebrew year. Month numbering follows Nisan=1 through Adar/Adar II=12/13. Select whether the birth occurred in Adar I, Adar II, or ordinary Adar when applicable.
Formula & Methodology
Hebrew age is target year minus birth year. Anniversary handling can depend on whether the birth year or target year is a leap year and whether the original month was Adar I, Adar II, or ordinary Adar. The current formula provides a transparent planning result; Gregorian conversion requires a dedicated Hebrew-calendar library.
Example: Hebrew age in a target year
Someone born in Hebrew year 5750 and checking year 5787 has a Hebrew-calendar age of 37 after the anniversary date in that year.
This formula-engine version does not convert Gregorian dates to Hebrew dates or return the Gregorian date of the anniversary. It does not determine sunset boundaries. Full conversion should use @hebcal/core, Hebcal's hdate package, or another tested calendrical implementation.
Not halachic guidance. Hebrew dates change at sunset, and anniversary customs can differ. Confirm religious observance questions with a qualified authority.
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Frequently Asked Questions
- Does a Hebrew date begin at midnight?
- No. In Jewish calendrical practice, the date changes at sunset, so birth time and location may matter.
- Why is Adar complicated?
- Hebrew leap years have Adar I and Adar II, while ordinary years have one Adar. Anniversary customs can depend on the original month and context.
- Does this version convert Gregorian dates?
- No. It calculates Hebrew age and anniversary planning fields. Full conversion requires a dedicated Hebrew-calendar implementation.
- Which library is suitable for full conversion?
- Hebcal provides maintained Hebrew/Gregorian conversion libraries and birthday or anniversary functionality.
Last updated 7/20/2026