01
Reference basis
Calculate a 12th- or 13th-birthday reference date from a birth date.
Bar and Bat Mitzvah Date Calculator
Calculate a 12th- or 13th-birthday reference date from a birth date.
Bar and Bat Mitzvah Date Calculator
The actual date can differ by Hebrew-calendar birthday and community practice.
How to use it
02
Not official guidance
Religion app tools help organize practical dates, quantities, bearings, and records. They do not replace doctrinal interpretation, religious obligations, or local official announcements.
よくある質問
Can I treat this as official?
No. Results are references. Confirm important dates or practices with your community or institution.
Is input sent to the server?
No. This page calculation runs in the browser.