The current difference between the Julian and Gregorian calendars is 13 days. But the difference will be extended to 14 days in 2100. How Is Orthodox New Year Celebrated?

There are a number of different calendars used around the world today, including the Gregorian calendar (in which the current year is 2025) and the traditional Chinese calendar (in which the ...

To get the new calendar aligned with the seasons, the pope had 10 days cut from the current calendar. Thursday, Oct. 4, 1582 (in the Julian calendar) was followed by Friday, Oct. 15, 1582 (in the ...

There have been several suggested improvements to our current calendar but so far none have stuck. Dec. 31 would be recognized as "Worldsday" (a world holiday). It would come between Saturday, Dec ...

While under the Julian calendar, a day shift accumulated every 129 years, that only happens every 3,333 years under the modern calendar. But that’s a problem for another millennium.

Read CNN’s Fast Facts about leap year. 2024 is a leap year, and leap day is February 29, 2024, on a Thursday.

The confusion grew: "February 30, 1712, came into existence in Sweden when the Julian calendar was restored and two leap days were added that year." Sweden’s final conversion to the Gregorian ...

The old calendar had been 365.25 days long; the new calendar was 365.2425 days long. The new calendar also shifted the dates, which had drifted by about two weeks, back in sync with seasonal shifts.

The IFC comprised 13 months of 28 days. The benefit of the new calendar was uniformity. Each month would start on a Sunday and end on a Saturday, so you’d never have to ask, for example, what ...