Date & time calculator
Hebrew Birthday Calculator
Use the Hebrew Birthday Calculator to convert a Gregorian birth date into a Hebrew or Jewish birth date and find the next Hebrew birthday, with after-sunset support and clear calendar results.
Result
Hebrew birthday calculator results
Your results will appear here
Enter your birth date and click Calculate to see your Hebrew birthday.
Hebrew Birth Date
Original Gregorian Birth Date
As-Of Date
Birth Time Rule Used
Countdown Summary
How the result was produced
These steps show the Gregorian date entered, the sunset rule applied, and how the next matching Hebrew birthday was found.
This calculator is a planning and conversion tool. It uses Hebrew calendar rules through Hebcal and does not claim to be an official NA, Chabad, or synagogue service.
Calculator overview
Quick Hebrew Birthday Calculator Overview
Use this Hebrew birthday calculator to convert a Gregorian birth date into a Hebrew calendar birthday and find upcoming Hebrew birthday dates. It helps with Jewish calendar planning while keeping the conversion clear.
Enter the civil birth date to calculate Hebrew date details and upcoming birthday observances.
Guide
Hebrew Birthday Calculator Guide
Use this guide to understand how a Gregorian birth date becomes a Hebrew birth date, why sunset matters, and how the next Hebrew birthday is found on the Gregorian calendar.
What This Hebrew Birthday Calculator Does
This Hebrew birthday calculator converts a Gregorian birth date into a Hebrew or Jewish birth date and then finds the next Gregorian date of that same Hebrew birthday. It is built for people who want a practical Hebrew birthday finder, Jewish birthday converter, or Hebrew calendar birthday calculator without having to jump between several tools.
It also handles one of the most important real-world questions: whether the birth happened before or after sunset. That matters because a Jewish day begins after sunset, so the Hebrew date can differ from the civil date even when the Gregorian date has not changed yet.
Trust note
The calculator uses Hebcal's Hebrew calendar library for conversion and anniversary logic rather than hand-rolled calendar math, which helps keep Adar and leap-year handling grounded in a vetted source.
Why Sunset Matters
In the Jewish calendar, a new day begins after sunset instead of at midnight. That means someone born on a Tuesday night might still have a Tuesday Gregorian birthday but a Wednesday Hebrew birthday.
Conversion workflow
Gregorian birth date + sunset rule → Hebrew birth date → next yearly Hebrew recurrence Before sunsetThe Hebrew date is based on the same civil day.
After sunsetThe Hebrew date may move to the next Jewish day.
Not sureThe calculator can show both outcomes when certainty is not possible.
Next Hebrew birthdayFound from the Hebrew date itself, not from adding solar years.
That is why sunset is not just a detail. It can change the Hebrew date, which then changes the future Hebrew birthday schedule that follows from it.
How Hebrew Birthday Conversion Works
The calculator starts with the Gregorian birth date you enter, applies the before-sunset or after-sunset rule, converts that outcome into a Hebrew date, and then finds the next yearly recurrence of that Hebrew date.
The next Hebrew birthday is always calculated from the Hebrew calendar side of the problem. It is not found by simply adding one Gregorian year to the original birth date, because Hebrew birthdays move around on the civil calendar.
Hebrew Leap Years and Adar
The Hebrew calendar includes leap years that add an extra Adar month. That means birthdays in Adar-related cases can recur in Adar, Adar I, or Adar II depending on the original birth date and the character of the target Hebrew year.
This is one of the main reasons people search for a Hebrew birthday calculator or Jewish birthday converter. The page follows Hebcal's birthday-anniversary rules, which are documented from Calendrical Calculations and explicitly account for these edge cases.
How to Use the Calculator
- 1Enter the Gregorian birth date
Start with the civil date of birth you want to convert.
- 2Choose the sunset rule
Select Before Sunset, After Sunset, or Not Sure depending on what you know about the birth time.
- 3Add an as-of date if needed
Leave it blank for today or enter a future date to preview a coming Hebrew birthday.
- 4Pick the display mode
Choose whether you want the main emphasis on the Hebrew birth date, the next Hebrew birthday, or the upcoming birthday list.
- 5Click Calculate
The result panel appears only after you run the conversion with your own values.
Example Conversion
Here is a sample Hebrew birthday conversion using a Gregorian birth date of March 15, 1990 with the after-sunset option selected and an as-of date of April 22, 2026.
Gregorian birth date March 15, 1990 Sunset rule After Sunset Hebrew birth date 19 Adar 5750 Next Hebrew birthday March 28, 2027
Example countdown
340 days 340 days until March 28, 2027.In this example, the birth is treated as happening after sunset, so the Hebrew date and the next Hebrew birthday schedule follow the next Jewish day rather than the civil day alone.
Tips / Notes
Birth time matters around sunset
If the birth was in the evening, the Hebrew date may belong to the next Jewish day.
Hebrew birthdays move on the Gregorian calendar
The same Hebrew date does not land on the same Gregorian date every year.
Adar cases need real leap-year logic
Birthdays in Adar, Adar I, or Adar II can recur differently depending on the target Hebrew year.
If you are not sure, show both possibilities
That is usually safer than assuming a definite Hebrew date when the result could change across sunset.
This page is a converter, not an official community service
It is designed to be practical and careful, but it does not represent Chabad, Aish, or any synagogue authority.
FAQ
Frequently Asked Questions
Clear answers about sunset handling, Hebrew leap years, Adar birthdays, and how the next Hebrew birthday is determined.
How do I find my Hebrew birthday?
Enter your Gregorian birth date, choose whether the birth happened before or after sunset, and run the calculator. It converts the date into the matching Hebrew birth date and can also show the next Gregorian date of that Hebrew birthday.
Why does the calculator ask whether I was born after sunset?
In the Jewish calendar, the day begins after sunset rather than at midnight. A birth in the evening can therefore map to the next Hebrew date, even if the Gregorian date has not changed yet.
What is the difference between a Hebrew birthday and a Gregorian birthday?
A Gregorian birthday repeats on the same civil date each year, while a Hebrew birthday repeats on the same Hebrew calendar date. Because the two calendars do not line up evenly, the Gregorian date of a Hebrew birthday moves from year to year.
How does the calculator handle Adar leap years?
It uses Hebcal's birthday-anniversary rules, which account for ordinary years, Hebrew leap years, and Adar, Adar I, and Adar II recurrence. That matters because Adar birthdays do not always repeat on the same named month in every year.
Can I find my next Hebrew birthday?
Yes. After the calculator determines your Hebrew birth date, it finds the next occurrence of that same Hebrew date and converts it back to the Gregorian calendar.
What if I do not know whether I was born before or after sunset?
Choose Not Sure. The calculator will show both possible Hebrew-date outcomes when the result could change across sunset, so you can avoid treating an uncertain answer as definite.
Can I use this as a Jewish birthday converter?
Yes. This page is built as a Jewish or Hebrew birthday converter, so it can help you find your Hebrew birth date and the next Hebrew birthday without needing a brand-specific tool.