Calendar
Hebrew birthday calculator
Your Hebrew birthday, and the exact date of a bar or bat mitzvah. Enter the birth date below; if the birth was after sundown, tick the box, because that moves the Hebrew date by a day.
Today on the Hebrew calendar
25 Tishrei
year 5787, from sundown last night
Bar mitzvah
13 years
reached on the Hebrew birthday, not the civil one
Bat mitzvah
12 years
in most communities
Leap years
7 in 19
they add a second Adar, which moves some birthdays
The calculator
Enter a birth date
It reads the Hebrew date, then walks it forward year by year and shows the Gregorian date each one lands on.
Bar mitzvah falls on this Hebrew date in year 5770, bat mitzvah in 5769.
Your Hebrew birthday, year by year
| Birthday | Hebrew year | Gregorian date | Note |
|---|---|---|---|
| 31st | 5788 | October 24, 2027 | |
| 32nd | 5789 | October 13, 2028 | |
| 33rd | 5790 | October 2, 2029 | |
| 34th | 5791 | October 20, 2030 | |
| 35th | 5792 | October 10, 2031 | |
| 36th | 5793 | September 28, 2032 | |
| 37th | 5794 | October 16, 2033 | |
| 38th | 5795 | October 6, 2034 | |
| 39th | 5796 | October 26, 2035 | |
| 40th | 5797 | October 14, 2036 | |
| 41st | 5798 | October 2, 2037 | |
| 42nd | 5799 | October 22, 2038 | |
| 43rd | 5800 | October 11, 2039 | |
| 44th | 5801 | September 30, 2040 | |
| 45th | 5802 | October 18, 2041 |
Each date begins at sundown the evening before. Where a note appears, the Hebrew date does not exist in that year and has been adjusted.
The moon on the night they were born, framed.
The moon as it was on the night of the Hebrew birth date, the date in Hebrew letters, and the moon on every Hebrew birthday up to the bat or bar mitzvah, each worked out like the dates above.
$79 framed, $36 as a print, free shipping to the US and Israel.
Make yours
Why it moves
Hebrew months follow the moon
A Hebrew month is one cycle of the moon, 29 or 30 days. Twelve of them come to 353, 354 or 355 days, about eleven days short of the solar year, so a Hebrew birthday slides earlier against the Gregorian calendar every year.
It does not slide away entirely. Seven years in every nineteen add a thirteenth month, Adar I, which pushes the date back by roughly a month and keeps Passover in spring. The net effect is a birthday that wanders across a window of a few weeks rather than drifting through the seasons the way an Islamic date does.
That is also why the table above sometimes carries a note. A date in Adar, or the 30th of a month that has only 29 days in a given year, has no exact equivalent, and the rule that settles it is stated in the row rather than applied quietly.
The sundown rule
A Hebrew day starts the evening before
Hebrew dates run sundown to sundown, not midnight to midnight. A baby born at 9pm was born on the next Hebrew day, so the Hebrew birthday, and with it the bar or bat mitzvah date, moves by one. That is the whole job of the checkbox in the calculator, and it is the single most common reason two people get different answers for the same birth.
- Born before sunset: the Hebrew date matches the civil date you would write down.
- Born after sunset: the Hebrew date is the following day. Tick the box.
- Not sure: a birth certificate gives the time, and sunset in Jerusalem runs from about 4:40pm in late December to about 7:50pm in late June.
The milestone
The date a bar or bat mitzvah actually falls on
A boy reaches bar mitzvah on his thirteenth Hebrew birthday and a girl bat mitzvah on her twelfth in most communities. That date is fixed by the Hebrew calendar, not by the party: the obligations begin then whether anything is held or not.
The celebration is usually put on a Shabbat near the date, which is why families end up working backwards from a Torah reading and a hall rather than forwards from the birthday. The calculator above gives the Hebrew date and its Gregorian equivalent, so you can see which Shabbatot sit either side of it.
The same Hebrew date is what a family uses a generation later, for a grandchild named after the same person. It is the one date that stays put while the civil one moves around it.
Planning around it
What decides the weekend
Holiday dates and Shabbat times decide which weekends are actually available, and Hebrew names covers the name that gets called to the Torah.
Calendar
Holiday dates
Every holiday this year and next, so you can see which weekends are already taken.
Weekly
Shabbat times
Candle lighting and havdalah for 158 cities, which sets the start and end of the day.
Frequently asked questions
What is a Hebrew birthday?+
The anniversary of your birth on the Hebrew calendar. It moves against the Gregorian calendar every year, so it usually falls a few weeks either side of the birthday you are used to.
When is my bar or bat mitzvah?+
On the Hebrew birthday itself: the thirteenth for a boy, the twelfth for a girl in most communities. The celebration is often held on a nearby Shabbat, but the legal age is reached on the Hebrew date, and the tool above gives it exactly.
Does the after-sunset rule matter for birthdays?+
Yes, and it catches people out. A baby born at 9pm belongs to the following Hebrew day, which can move the Hebrew birthday and therefore the bar or bat mitzvah date by a full day.
What if I was born in Adar in a leap year?+
Then your birthday exists in some years and not others. Leap years have Adar I and Adar II; ordinary years have a single Adar. The table above flags every year that needed adjusting and explains what it did.
How do you say happy birthday in Hebrew?+
Yom huledet sameach (יום הולדת שמח). For a milestone, Israelis often add "ad me'ah ve'esrim": until 120, the age Moses reached.