Zman — Jewish Time
Jewish time, to the rega
Free · Designed for iPhone. Not verified for macOS.
The present moment in Jewish time: Hebrew date, hour, chelek and rega, set by the rotation of the Earth rather than by the atomic clock.
Zman shows the present moment in Jewish time, and only in Jewish time: the Hebrew date, the hour of the day, the chelek and the rega, with no Gregorian date and no civil clock.
The day begins at 18:00, Jerusalem mean time. It has 24 hours; each hour, 1,080 chalakim; each chelek, 76 rega’im (Rambam, Hilchot Kiddush HaChodesh). These divisions are proportions of the day, not seconds: a day is one real rotation of the Earth, however long it lasts.
That is why Zman does not follow the atomic clock but UT1, the time scale that follows the Earth’s rotation as measured by the IERS. The app counts rega’im on your phone and regularly re-syncs with the zman.technology server, which applies the measured correction. Offline, it carries on with the last known correction.
• The clock: the Hebrew date in letters and numbers, the day of the week, hour · chelek · rega live, and the number of rega’im since the molad Tohu
• The luach: each Hebrew month as a grid, Sunday to Shabbat, with Rosh Chodesh, festivals, the Omer count and the month’s molad
• The year’s festivals and fasts, postponements included (fasts moved after Shabbat, Ta’anit Esther brought forward, Yom HaAtzmaut), in Israel or the diaspora, with a countdown to the next one in days, hours and chalakim
• The molad: a countdown to the next one, and every molad of the year in the format of the Birkat HaChodesh announcement
• The structure of the year: length, common or leap, keviah, place in the nineteen-year cycle
• Reminders, if you want them: the evening before Rosh Chodesh and festivals, and at the moment of the molad, scheduled on the device
• The manifesto, the method and their sources, to read in the app
• The state of the measurement: age of the IERS data, measured or predicted
• A widget for the Home Screen and Lock Screen, with the elapsed part of the hour
• An Apple Watch app, with complications for your watch face
• In English, French and Hebrew
The calendar is computed from the rules of the fixed calendar (molad, dehiyot), checked by tests. Method and sources: zman.technology/en/methode.
No account, no ads, no tracking. The API data is published under CC BY 4.0, the code under the MIT licence.
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The developer, 100-8 Studio, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
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Information
- Seller
- ERLIGMANN MATHIAS
- Size
- 3.4 MB
- Category
- Reference
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
English and 2 more
- English, French, Hebrew
- Age Rating
4+
- 4+
- Copyright
- Copyright © 2026 Mathias Erligmann. All rights reserved.