The original Roman calendar divided the year from March to December into 10 months of either 29 or 31 days, based on lunar ...

At least, that was the idea. Revolutionary as the Julian calendar was, it wasn't perfect, and fell out of alignment over time. In 1582, Pope Gregory XIII introduced the Gregorian calendar ...

The shift from Washington’s Birthday to Presidents' Day began in the late 1960s, when Congress proposed the Uniform Monday ...

Pope Francis indicated that the Catholic Church was willing to accept a common date for celebrating Easter in the West and the East.

Happy February 29! It doesn’t come round very often, so make sure you enjoy it. But why do we have these extra days? Well, if we didn’t, the seasons would ...

"I try to keep it running." Bowan is one of the many Orthodox Christians who celebrate the holiday according to the Julian Calendar. A part of his life he's always embraced. "This is what I was ...

They initially decided to base it on the solar calendar known as the Julian calendar. Due to miscalculations, the Julian calendar overestimates the solar year by approximately 11 minutes.

In 1752, from Sept. 3rd to 13th, people witnessed a unique historical event. Eleven days were cut from the calendar and deleted forever.

Teymour Taj celebrates the beginning of 2025 by exploring the weird and wonderful history of calendars As 2025 rolled in, ...

Play the USA TODAY Daily Crossword Puzzle. In 2026, Easter will be April 5 based on the Gregorian calendar and April 12 based on the Julian calendar. Why isn't Easter on a set day? According to ...