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Gregorian Date Converter

Quick answer

This calculator converts Gregorian dates to and from all 13 other calendars on one page.

  • Enter a date, pick the systems, and the exact equivalent appears instantly.

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

Inputs

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Steps to use

date → JDN (source epoch) → date (target epoch)

This hub converts Gregorian dates to and from every other calendar system on one page. Enter the day, month, and year, pick the two systems, and the exact equivalent appears instantly — the conversion goes through the Julian Day Number, so each system's own epoch and leap rules are applied.

  1. 1

    Step 1

    Type the date or two dates to compare.

  2. 2

    Step 2

    After entering the values, click "Calculate" to view the output.

  3. 3

    Step 3

    Save or share the result as needed.

Use Cases

Any Gregorian pair, one page

Instead of a dedicated page per system pair, this hub converts a Gregorian date to any other system instantly — pick the two calendars and enter the date once.

Cross-calendar planning

The same date lands differently every year across calendars; converting the full date — day, month, and year — keeps occasions and deadlines accurate in both systems.

Tips

  • 1

    Confirm the calendar system before converting.

  • 2

    Use the YYYY-MM-DD format for reliability.

  • 3

    Time-zone differences can shift a date by a day.

Common Mistakes

  • Entering a Gregorian date while the source system is set to another calendar — check the from-system before converting.

  • Adding or subtracting a fixed number of years to move between calendars instead of converting the full date.

FAQs

Which calendars can I convert between here (Gregorian Date Converter)?

All supported systems in both dropdowns — Gregorian, Hijri, Hebrew, Persian, Coptic, Ethiopian and more, in any direction.

How is the conversion computed (Gregorian Date Converter)?

Through the Julian Day Number: the source date maps to a day number using its own epoch, then that number maps to the target system — no fixed year offset.

Why do some results say approximation (Gregorian Date Converter)?

A few systems don't have exact arithmetic rules implemented; those conversions are labelled as best-effort approximations rather than exact.

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