Gregorian Calendar Converter

Free Gregorian calendar converter. Convert Julian, Hebrew, Islamic, and other calendar dates to the Gregorian calendar used worldwide.

Convert dates from various calendar systems to the Gregorian calendar—the standard civil calendar used worldwide. Support for Julian, Hebrew, Islamic, and other calendar systems.

Common use cases

  • Historical date research
  • Genealogical record interpretation
  • Religious date conversions
  • Academic historical studies
  • International date coordination

How to use

  1. Select the source calendar system
  2. Enter the date in that calendar
  3. View the Gregorian equivalent
  4. See day of week and other details
  5. Handle historical date corrections

FAQ

What is the Gregorian calendar?

Introduced in 1582 by Pope Gregory XIII, it's now the international standard civil calendar.

When did countries adopt it?

Catholic countries adopted it in 1582; Britain and colonies in 1752; Russia in 1918; Greece in 1923.

What's the Julian calendar?

The Julian calendar was used before Gregorian and is still used by some Orthodox churches.