Almanac & sky · NUMORA
Zuoya Calculator
Shopkeepers need the offering days — not a surprise at month-end.
Open interactive calculatorHow to use
From the civil date, the next lunar 2nd or 16th. Leap months still use the lunar day. Not a trading calendar.
Formula
next lunar day in {2, 16}
FAQ
Is this Zuoya calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
From the civil date, the next lunar 2nd or 16th. Leap months still use the lunar day. Not a trading calendar.
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