Friday December 22, 1380
A date scroll with Latin text from β€œThe Extremes of Good and Evil” by Cicero, written in 45 BC.

December 22, 1380: Day of the Week

December 22, 1380 was the 357th day of the year 1380 in the Gregorian calendar. There were 9 days remaining until the end of the year. The day of the week was Friday.

The day of the week for December 22, 1380 under the old Julian calendar was Saturday. Did you notice the difference with the Gregorian calendar?

If you are trying to learn French then this day of the week in French is vendredi.

A person born on this day will be 644 years old today. If that same person saved a dollar every day starting at age 3, then by now that person has accumulated $234,178.00 today.

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Here’s the December 1380 Gregorian calendar. You can also browse the full year monthly 1380 calendar.

December 1380
SunMonTueWedThuFriSat
     12
3456789
10111213141516
17181920212223
24252627282930
31      

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Zodiac & Birthstone

Capricorn is the zodiac sign of a person born on this day. Turquoise is the modern birthstone for this month. Onyx is the mystical birthstone from Tibetan origin that dates back over a thousand years.

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December 22, 1380 by the Numbers

  • 235,273 days since December 22, 1380
  • 644 years, 1 month, and 26 days ago
  • 7,729 months since then
  • December 22 is in the 51st week of the year 1380 (ISO 8601)
  • 33,610 weeks ago
  • The year 1380 is a leap year

Gregorian versus the old Julian calendar

A note to students, teachers, scholars and anyone else passionate about this topic. As stated in the front page, this website is using the Gregorian calendar as the basis for all “day of the week” computation whether or not the Gregorian calendar is relevant for the date in question (December 22, 1380). Educators should point out the primary reason why Pope Gregory XIII introduced a new calendar system in October 1582. That is, to make the computation for the annual date of Easter more accurate since it is the foundation of the Christian faith.

Even with that purpose in mind, the Gregorian calendar too will become out of sync. It has a known approximation error of about one day for every 7,700 years assuming a constant time interval between vernal equinoxes (which is not true). This is better compared to the one day for every 128 years error of the Julian calendar.

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