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Cake day: June 10th, 2023

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    • with the year being 365.24219 days you don’t get a lot of factors to work with (365 ⇒ 1, 5, 73, 365)
    • there have been various proposals for perennial calendars – in a perennial calendar, months always start on the same day, have the same number of days, no worries about “last Thursday of the month” calculations for holidays
      • if you deal with the year as 364 days + filler, you get more factors to work with (364 ⇒ 1, 2, 4, 7, 13, 14, 26, 28, 52, 91, 182, 364)
        • fiscal quarters are always the same length and you get an extra day during the winter holidays
      • the easiest being something like a 13 month calendar (each month being exactly 4 weeks, 28 days) = 364 days + 1 year day + 1 leap day – this gets a lot of flack from religious groups because they don’t like the extra days messing with a 7 day week cycle
        • this keeps the 365 day year and uses the same calculations for adding in leap days
      • leap week calendars get around that by doing a 364 day year and then adding in a whole leap week to bring things back into alignment (you can do this yourself using ISO week dates and looking for week 53)
        • calculations for leap years are a bit more elaborate and don’t fit as easily into a simple mnemonic