# Calendar Fun and Trivia

**URL:** <https://boards.straightdope.com/t/calendar-fun-and-trivia/679203>\
**Category:** Miscellaneous and Personal Stuff I Must Share\
**Created:** [January 19, 2014, 1:41pm UTC](https://boards.straightdope.com/t/calendar-fun-and-trivia/679203 "2014-01-19T13:41:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Zeldar](https://avatars.discourse-cdn.com/v4/letter/z/b77776/32.png) [@Zeldar](https://boards.straightdope.com/u/Zeldar)\
**Post date:** [January 19, 2014, 1:41pm UTC](https://boards.straightdope.com/t/calendar-fun-and-trivia/679203/1 "2014-01-19T13:41:32Z")

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In the Death Pool thread **RTFirefly** made [this post](http://boards.straightdope.com/sdmb/showpost.php?p=17027971&postcount=745)

> [@](#):
>
> As of 25 minutes ago, we’re 5% of the way through 2014.

Being a fan of calendars and dates and the like, it dawned on me that I had never taken the trouble to break down the year (the 365 day version – skipping Leap Years) into fractions. So using this [Day of Year Calendar](http://disc.gsfc.nasa.gov/julian_calendar.shtml) it was easy enough to come up with this starter set:

```auto

 10% 36 Feb/5
 20% 73 Mar/14
 30% 109 Apr/19
 40% 146 May/26
 50% 182 Jul/1
 60% 219 Aug/7
 70% 255 Sep/12
 80% 292 Oct/19
 90% 328 Nov/24
100% 365 Dec/31

```

Then I had the thought that other calendar fans might have other tricks or oddities worth sharing, so I started this thread.

What fun things can you share about the 365-day year? Calendars in general?

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**Author:** ![EmilyG](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/emilyg/32/364_2.png) [@EmilyG](https://boards.straightdope.com/u/EmilyG)\
**Post date:** [January 19, 2014, 5:58pm UTC](https://boards.straightdope.com/t/calendar-fun-and-trivia/679203/2 "2014-01-19T17:58:18Z")

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July 2 is the day that’s in the middle of a 365-day year.

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**Author:** ![K364](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/k364/32/5_2.png) [@K364](https://boards.straightdope.com/u/K364)\
**Post date:** [January 19, 2014, 6:28pm UTC](https://boards.straightdope.com/t/calendar-fun-and-trivia/679203/3 "2014-01-19T18:28:33Z")

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Well, there’s the old chestnut: [Doomsday Rule](http://en.wikipedia.org/wiki/Doomsday_rule)

Which, for 2014 says that April 4, June 6, August 8, October 10 and December 12 are all Fridays (i.e. 4/4, 6/6, 8/8, 10/10/, 12/12)

There’s much more to it than that. For example, 5/9, 9/5, 7/11, 11/7 are all Fridays (use the mnemonic “Working 9 to 5 at the 7/11”)… and so is the last day of January and the last day of February.