1345
13 Months
(startrek.website)
Post memes here.
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Laittakaa meemejä tänne.
Depends on the year you start, it is thrown off by leap years.
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.
I was just talking about why there have been more fridays the 13ths since 1500.