# Uposatha by the Suttas — Buddhist Moon-Day Calendar

> Buddhist Moon-Day Calendar (iPhone/iPad app by Pavel Katorgin.)

- Source: https://appshunter.io/ios/app/uposatha-by-the-suttas/id6816601259 (this page in markdown: same URL + `.md`)
- Developer: [Pavel Katorgin](https://appshunter.io/developer/6813706219)
- Category: Lifestyle, Reference
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 10 MB
- Languages: American English
- Released: 2026-10-24
- Data updated: 2026-10-27

## What is Uposatha by the Suttas?

Six Uposatha days a month, the 8th, 14th and 15th, as the Buddha names them. Real lunar days, notifications, meal time and offline reminders, each rule from the suttas.

THE DAY BEGINS IN THE EVENING
In the suttas a day is "night and day" (AN 3.70), so an Uposatha begins at sunset and lasts through the night and the next day. The app gives the exact moments for your place: when it begins, what it covers, when it ends.

REAL LUNAR DAYS
A lunar day changes at a moment, not at midnight, and lasts 19 to 26 hours. The app reads it from the real Moon (astronomy-engine, accurate to about a minute), and when a lunar day is skipped or repeats against the calendar, it says so under the date.

MEALS: THE TIME FOR FOOD AND VIKĀLA
The card shows how long is left until midday, and after it, vikāla, "the wrong time", until dawn (Pc 37). Midday by the sun or by the clock. Optional reminder: the Vinaya definition of vikāla read aloud.

THE THREE PARTS OF THE DAY AND OF THE NIGHT
Morning, midday, evening; first, middle and last watch (MN 53, SN 28.1). The app divides today's daylight and darkness for your place, marks the part going on now, and shows how the monks of the suttas spend it: alms, seclusion, meeting; walking, the lion's posture, rising. A reminder at the start of each part can name it in Pali.

READ THE SOURCE
"From the suttas" and "Key suttas": about 20 passages in Pali and English (AN 3.70 on the cowherd's, the Nigaṇṭha's and the Noble One's Uposatha, AN 10.46, MN 146, Kd 2, MN 65, MN 66, MN 70 and more). "Read" opens the sutta at the exact line in Dhamma.Gift.

WIDGETS ON THE HOME SCREEN
The next Uposatha with a countdown, the Moon as it is now, the part of the day with kāla and vikāla, and the month calendar. Small, medium and large; the larger ones turn between their slides with a tap, without opening the app.

REMINDERS THAT WORK OFFLINE
Set on the device: they come with the app closed, from "when it begins" up to two days before, for the 8th, 14th and 15th, each with its own sound.

ALSO
• Three views: by dates, by months and weeks, month calendar
• Moon now: phase, illumination, age, current lunar day
• "By the suttas" off: the modern four-day scheme
• Twilight: count from sunrise, civil, nautical or astronomical dawn
• Subscribe in Google or Apple Calendar, or download .ics
• English and Russian, light and dark theme
• Press and hold the app icon: the next Uposatha days and the calendar

PRIVATE
Your location stays on the device, rounded to about a kilometre. No account, no ads, no tracking.

Thai, Sri Lankan and Burmese communities keep calendars by tradition that can differ by a day. If you keep the Uposatha with a monastery, follow its calendar.

Made by Dhamma.Gift, free, as a gift of the Dhamma.

## Is Uposatha by the Suttas safe?

Not enough ratings yet to assess Uposatha by the Suttas.

## Is Uposatha by the Suttas legit?

Uposatha by the Suttas has limited verification signals. The AppsHunter Legitimacy Score for Uposatha by the Suttas is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-25

No release notes.

## More apps by Pavel Katorgin

- [Dhamma.Gift](https://appshunter.io/ios/app/dhammagift/id6813706217)
- [Dict.Dhamma.Gift](https://appshunter.io/ios/app/dictdhammagift/id6816639947)

All apps by Pavel Katorgin: https://appshunter.io/developer/6813706219

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-27.*