Cultures throughout history have come up with their own unique ways to track the days, months, and seasons.

In modern times, everyone knows that a year is 365 days long (with the occasional Leap year in place to keep things nice and tidy). While this seems obvious to us all today, it turns out that making a ...

The Gregorian calendar, however, was not adopted by the American Colonies until 1752. That's why George Washington was not born on Washington's Birthday. In our time, we celebrate Washington's ...

Pope Gregory XIII (born Ugo Boncompagni in 1502) who introduced the “Gregorian” calendar in 1582. Until then, the Julian calendar had been in use since 45 BC.

In 1582, Pope Gregory XIII introduced the Gregorian calendar to correct discrepancies in the existing Julian calendar, which had been in use since the time of Julius Caesar.

According to timeanddate.com, in 1700, Sweden leaders had planned to convert from the Julian calendar to the Gregorian calendar. Like the Gregorian calendar, the Julian calendar has 12 months and ...

Like the Julian calendar, the Gregorian calendar consists of 12 months of 28, 30 or 31 days with an extra day added to February in each leap year.

In 1582, Pope Gregory XIII (hence the name, Gregorian calendar) ... Steve Morse has a handy Julian/Gregorian calendar conversion app on his One-Step Webpages site should you need to covert some dates.

The Julian calendar also introduced an extra day every four years—what we now call leap years, ... The Gregorian calendar also formalized Jan. 1 as the start of every new year.

To fix the calendar going forward, he introduced what we use now: the Gregorian calendar. It’s essentially the Julian calendar, but with a new rule: All years divisible by four are to be leap ...

Ancient Roman Calendar. Today, most of the West uses the Gregorian calendar, which has its roots in two earlier calendar systems: the Julian calendar and the Roman calendar.The Roman calendar was ...