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5 Weekends in 1 Month Happens More Often Than Every 823 Years

5 Fridays, 5 Saturdays, and 5 Sundays in a month? It happens only once every 823 years! This popular urban myth has been circulating the internet for a while. However, it is precisely that: a myth.

Illustration image

Busting the “5 Fridays, 5 Saturdays, & 5 Sundays in 1 month” myth.

©timeanddate.com

Before you get too excited about this once-in-a-lifetime event and start telling your family and friends, know this: any such claims are false. Combinations of days like 5 Fridays, 5 Saturdays, and 5 Sundays occur much more often than every 823 years!

The 823 Years Myth

If you have an email or a social media account, chances are that you have come across a viral post that claims an upcoming month has a rare combination of weekdays. Share it, the message states, or beware of some bad luck.

A recent version goes something like this:

“March 2024 has 5 Fridays, 5 Saturdays, and 5 Sundays. This happens only once every 823 years. The Chinese call it “silver pockets full” or “money bags.”

The email is partially correct. March 2024 does have 5 Fridays, 5 Saturdays, and 5 Sundays. But this is neither special nor unusual. You won’t need to wait another 823 years for this weekday combination.

A calendar month that contains 5 Fridays, 5 Saturdays, and 5 Sundays actually occurs nearly every year—August 2025, May 2026, and August 2026 all have the same weekday pattern.

First Day of the Month

The weekday combinations these 823-year messages refer to aren’t exceptional either. A quick look at a calendar will show that the first 3 weekdays of any 31-day month will be repeated 5 times in that month. So, any month that has 31 days and begins on a Friday will have 5 Fridays, 5 Saturdays, and 5 Sundays. Similarly, any 31-day month that begins on a Tuesday will have 5 Tuesdays, 5 Wednesdays, and 5 Thursdays.

Recurring Monthly Calendars

Ready for some math? Here’s a more mathematical reasoning of why the 823-year claim is a myth:

Every year has 7 months with 31 days. Each of these months has at least 3 weekdays that happen 5 times during the month. For example, January 2024 has 5 Mondays, 5 Tuesdays, and 5 Wednesdays. May 2024 has 5 Wednesdays, 5 Thursdays, and 5 Fridays.

There are 7 different days a month can start with. So, on average, the combination of any 3 days occurring 5 times in a calendar month will happen once a year.

In any given year, there are only 6 such combinations of days. This is because 2 months with 31 days start on the same weekday. In a common year, January and October have the same calendar, while January and July look the same in a leap year.

5-Day Combinations in a Month

Dates:1/ 8 / 15 / 22 / 292 / 9 / 16 / 23 / 303 / 10 / 17 / 24 / 31Comments
January 20245 Mondays5 Tuesdays5 WednesdaysSame as July 2024
March 20245 Fridays5 Saturdays5 Sundays
May 20245 Wednesdays5 Thursdays5 Fridays
July 20245 Mondays5 Tuesdays5 WednesdaysSame as January 2024
August 20245 Thursdays5 Fridays5 Saturdays
October 20245 Tuesdays5 Wednesdays5 Thursdays
December 20245 Sundays5 Mondays5 Tuesdays
January 20255 Wednesdays5 Thursdays5 FridaysSame as October 2025
March 20255 Saturdays5 Sundays5 Mondays
May 20255 Thursdays5 Fridays5 Saturdays
July 20255 Tuesdays5 Wednesdays5 Thursdays
August 20255 Fridays5 Saturdays5 Sundays
October 20255 Wednesdays5 Thursdays5 FridaysSame as January 2025
December 20255 Mondays5 Tuesdays5 Wednesdays

Topics: Fun, Dates