Julian to Gregorian Converter

Convert between Julian and Gregorian calendars.

Convert dates between Julian and Gregorian calendars instantly. Free historical date converter.

About J/G Converter

Convert between Julian and Gregorian calendars.

Applies century-dependent offset for O.S./N.S. conversions.

Where it is used

Historical records, genealogy, research.

How to use the J/G Converter

  1. Julian Calendar Date (YYYY-MM-DD) — enter the value.
  2. Calculate — press the Calculate button to see the result instantly above.

Formula

Add 10–13 days by century (Gregorian reform 1582).

Examples

Example

julian:1900-01-01
Result: Julian 1900-01-01 → Gregorian 1900-01-14

Frequently Asked Questions

Which offset?
1582–1700: +10d; 1700–1800: +11d; 1800–1900: +12d; 1900+: +13d.
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