The calendar repeats every 11 years, so the maximum this can be is 11 years...

so October in 2021 will be the same as October in 2010 (handy if you want to reuse those calendars), go ahead look on your computer or phone right now.

However, we have a few months that have 31 days, and we only need one of them to begin on a Friday.

In 2013, March starts on a Friday (and 2024, etc)...

In 2014, August starts on a Friday (and 2025, etc)...

There are other months in other years that have 3 days that occur 5 times too, so, it's not special.

Next time someone tells you something about some weird calendar event, think about the 11 year cycle, and go back/forward 11 years and see if it's true.

## Friday, October 08, 2010

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## 1 comment:

Every 11 years isn't quite right either. The monthly calendars repeat in a 6-5-6-11 pattern. Thus, October had 5 Fridays, 5 Saturdays and 5 Sundays in 1993, 1999, 2004 and 2010, and will again in 2021.

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