Julian and Gregorian
Convert dates between the Julian and Gregorian calendars: Old Style and New Style with a solution and the day of the week.
What to find:
Enter the month as a number from 1 to 12 and the year from 1 to 9999.
The calendar converter converts dates between the Old Style (Julian calendar) and the New Style (Gregorian calendar). It is useful for historical dates.
Difference between the calendars
| Period | Difference |
|---|---|
| 16th–17th centuries (after 1582) | 10 days |
| 18th century | 11 days |
| 19th century | 12 days |
| 20th–21st centuries | 13 days |
The periods change in March 1700, 1800 and 1900. Russia adopted the New Style in 1918.
Example. The October Revolution: October 25, 1917 Old Style = November 7, 1917 New Style.
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