Juliano → Gregoriano (aprox.)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
calendários
About this calculator
The Julian to Gregorian calendar converter is a useful tool for converting dates between the two calendars. The Julian calendar was used for centuries, but has a 13-day difference with the Gregorian calendar, especially in the 20th century.
This difference can cause problems in various situations, such as calculating historical event dates or comparing dates in different calendars.
The formula used for this conversion involves concepts of calendars, including understanding the difference of days between the two calendars.
When to use this calculator? It is recommended to use this tool to convert dates in situations where you need to compare dates in different calendars, such as in historical research or in comparing dates in different date systems.
Frequently asked questions
What is the main difference between the Julian and Gregorian calendars?
The main difference is the exclusion of 10 days from October 1582 by the Gregorian calendar to realign the date of Easter with the astronomical season.
When is it recommended to use this calculator?
It is recommended to use this tool to convert dates in situations where you need to compare dates in different calendars, such as in historical research or in comparing dates in different date systems.
Is the Julian calendar older?
Yes, the Julian calendar was introduced by Roman Emperor Julius Caesar in 45 BC, while the Gregorian calendar was adopted in 1582.
Is the 13-day difference uniform in all years?
No, the 13-day difference is not uniform in all years. The difference occurs mainly in the 20th century and in some specific years.