Date and calendar converter

Enter your values to see the result, check the formula and copy your calculation.

Your inputs1

Your result2

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Enter your values, then calculate.

Your calculation stays in your browser.

The formula, explained

calendar date → supported calendars

Conversion uses calendars supported by your browser. Religious dates may differ with local observation; the date is evaluated at noon UTC.

How to use this tool

Check the required inputs: gregorian date.

Choose the units and options that match your task. Calculate, check the result and use Copy or Print to keep a record. Rounding applies to the display; keep more precision in intermediate steps.

Where are my inputs processed?

Calculations run in your browser. Form values are not sent to Analytics. Copying, printing, sharing or opening an external service is your choice.

Method and interface checked on 2026-09-12 · Report an error