Bar and bat mitzvah date calculator
A boy becomes bar mitzvah on the Hebrew date when he completes 13 Hebrew years, and a girl becomes bat mitzvah when she completes 12. A boy born on 5 May 2014 (5 Iyar 5774) becomes bar mitzvah on 5 Iyar 5787: Wednesday, 12 May 2027. The tool works it out from any date of birth, including a birth after sunset, Adar in a leap year and the 30th of a month, and writes the line for the film's title and for the invitation.
Work out the date
This browser can't work out Hebrew dates. The example and the tables on this page still hold.
Example: born on 5 May 2014
- Hebrew date of birth
- 5 Iyar 5774
- Bar mitzvah
- 5 Iyar 5787
- Gregorian date
- Wednesday, 12 May 2027
- For the film's title
- ה׳ באייר תשפ״ז · 12 May 2027
- For the invitation
- Wednesday, 5 Iyar 5787 (12 May 2027)
The Hebrew day begins in the evening, so the bar mitzvah begins on Tuesday evening, 11 May 2027.
This is the date by the rules in the sources. Confirm it with your community's rabbi before you set the date of the event.
The special cases, and a source for each rule
Most of the time the date is simple: the same day of the same Hebrew month, 12 or 13 years on. These are the cases where the date moves, what the tool shows for each, and where the rule is written.
| Case | What the tool shows | Sources |
|---|---|---|
| Bar and bat mitzvah | A bar mitzvah on the day a boy completes 13 Hebrew years; a bat mitzvah on the day a girl completes 12. A family that celebrates a bat mitzvah at 13 can choose “Bar mitzvah (13)”: the count is the same. | Pirkei Avot 5:21, Mishnah Niddah 5:6 |
| Born after sunset | The Hebrew date of the next civil day. Opinions differ on the time between sunset and nightfall, so for a birth close to sunset, ask your rabbi. | The Hebrew calendar's rule |
| Born in Adar of a regular year, and the bar or bat mitzvah year has two Adars | Adar II. | The Rema, Orach Chayim 55:10, Mishnah Berurah 55:45, Kaf HaChaim 55:61 |
| Born in Adar I, and the bar or bat mitzvah year has two Adars | Adar I, with the Adar II date beside it, by the Magen Avraham's view. | Mishnah Berurah 55:43, Kaf HaChaim 55:59, Magen Avraham 55:10 |
| Born in Adar II, and the bar or bat mitzvah year has two Adars | Adar II. | Mishnah Berurah 55:43, Kaf HaChaim 55:59 |
| Born in Adar I or Adar II, and the bar or bat mitzvah year has one Adar | Adar. | Shulchan Arukh, Orach Chayim 55:10, Mishnah Berurah 55:44 |
| Born on 30 Cheshvan, and in the bar or bat mitzvah year Cheshvan has 29 days | 1 Kislev. By the same reasoning, 30 Kislev moves to 1 Tevet, and 30 Adar I to 1 Nisan in a year with one Adar. | Magen Avraham 55:10, Mishnah Berurah 55:45, Kaf HaChaim 55:60 |
| Born on 1 Kislev when Rosh Chodesh was one day, and in the bar or bat mitzvah year it is two days | 30 Cheshvan, the first day of Rosh Chodesh, with 1 Kislev, the birthday calendars show, beside it. | Mishnah Berurah 55:45 |
| Born on 1 Tevet when Rosh Chodesh was one day, and in the bar or bat mitzvah year it is two days | 30 Kislev, with 1 Tevet, the birthday calendars show, beside it. | Kaf HaChaim 55:60 |
Worked examples
One birth for each rule, and what it gives at 12 and at 13. The tool itself worked them out, with the same code that runs in the form above.
| Born | Bat mitzvah (12) | Bar mitzvah (13) | Why |
|---|---|---|---|
| 15 Adar I 5782 | 15 Adar 5794 | 15 Adar I 5795 | Born in Adar I. In a regular year, the single Adar; in a leap year, Adar I, or Adar II by the Magen Avraham's view. |
| 14 Adar 5785 | 14 Adar 5797 | 14 Adar II 5798 | Born on Purim of a regular year. When the bar mitzvah year has two Adars, the day moves to Adar II, where Purim falls too. |
| 1 Adar II 5784 | 1 Adar 5796 | 1 Adar 5797 | Born on 1 Adar II. In a regular year, the day is 1 Adar. |
| 30 Adar I 5776 | 1 Nisan 5788 | 1 Nisan 5789 | Born on 30 Adar I. Adar in a regular year has 29 days, so the day moves to 1 Nisan. |
| 30 Cheshvan 5776 | 30 Cheshvan 5788 | 1 Kislev 5789 | Born on 30 Cheshvan. In a year when Cheshvan has 29 days, the day moves to 1 Kislev. |
| 30 Kislev 5780 | 30 Kislev 5792 | 1 Tevet 5793 | Born on 30 Kislev. In a year when Kislev has 29 days, the day moves to 1 Tevet. |
| 1 Kislev 5778 | 1 Kislev 5790 | 30 Cheshvan 5791 | Born on 1 Kislev when Rosh Chodesh was one day. In a year when it is two days, the day is the first of them, 30 Cheshvan; the birthday calendars show is 1 Kislev. |
| 1 Kislev 5778 , after sunset | 1 Kislev 5790 | 30 Cheshvan 5791 | Born after sunset: the Hebrew date is the next day's, 1 Kislev, so the result matches the row above. |
How the tool works it out
The tool converts the date to a Hebrew date with the Hebrew calendar built into your browser, adds 13 years for a bar mitzvah or 12 for a bat mitzvah, and applies the rules in the table.
The sources speak of a bar mitzvah. The same count of full years applies to a bat mitzvah at 12, and the tool counts it that way.
We checked the conversion day by day, from 1900 to 2100, against the calendar Glim writes its title dates from, and the Hebrew birthdays against a widely used open-source calculator. The one difference is a one-day Rosh Chodesh that becomes two days: there the tool follows the Mishnah Berurah and the Kaf HaChaim, and shows the calendar's date beside it.
The tool doesn't rule on Jewish law, and it doesn't work out the Torah portion, prayer times or a yahrzeit. Confirm the date with your rabbi.
The date in the film's title
The opening and the closing of a film made with Glim can carry a date: choose “Add a date”, pick the day, and choose how it's written: “Hebrew and Gregorian”, “Hebrew” or “Gregorian”. Glim writes the Hebrew date of the civil day you picked, and with “Hebrew and Gregorian” it reads like the tool's line “For the film's title”.
An evening event already belongs to the next day's Hebrew date, but Glim writes the Hebrew date of the civil day. So for an evening event, choose “Just the Hebrew date” here and tick “The event is after sunset”. In the title, choose “Gregorian”, and type the line the tool gives for it into the “Second line”.
What happens to the date you enter
The calculation happens in your browser. The date you enter isn't sent to us, stored by us or written into the page's address, so a link to this page always opens on the example.
What Glim is
Glim turns photos of the people you love into a short, finished film, with AI animation, an opening, music and Hebrew titles. It's an Israeli service that works in your browser, and the film is a gift for any moment, from a first birthday to a parent's 70th. Some families also make one in memory of someone who is gone. Each animation is usually ready in 4–5 minutes, the first animation is free, and a whole film costs ₪79 to ₪349, paid once. Glim isn't a video editor, a template app or a talking-photo app.
A bar or bat mitzvah film, from your photos
In a Growing film each animation moves from one photo to the next, from the first years to today. The first animation is free, and you pay only when you go on to a whole film.