• rmuk@feddit.uk
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    1 year ago

    Did you know that the 13th day of the month is more likely to be a Friday than any of the other weekdays?

    • billwashere@lemmy.world
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      1 year ago

      I’m a nerd so I had to write code to check this out.

      https://pastebin.com/62kwesZz

      So from 1/1/1500 until 12/31/2023:

      Weekday counts: Monday: 898 Tuesday: 897 Wednesday: 901 Thursday: 896 Friday: 901 Saturday: 896 Sunday: 899

      No idea why, and other than a tie with Wednesday, this is indeed true. Well if my code is correct.

        • Makeitstop@lemmy.world
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          1 year ago

          For most proposals like this, new years day and leap day wouldn’t have a day of the week. And therefore the calendar wouldn’t change from year to year.

      • uis@lemmy.world
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        1 year ago

        until 12/31/2023:

        My eyes see mixed-endian! I want them to unsee it!

        Decide already whether you want 2023.12.31 or 31.12.2023.

      • rmuk@feddit.uk
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        1 year ago

        I think your code is fine. The Gregorian Calendar actually runs on a 400-year cycle (i.e. the pattern caused by 7-day weeks, variable-length months and leap years repeats every 400 years) so if you re-ran the code against a 400-year period you’d get the correct ratios.