1345
13 Months
(startrek.website)
Post memes here.
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Laittakaa meemejä tänne.
Since the 12th month is December, a 13th month should obviously be called Undecember (the undec- prefix meaning 11 in Latin).
Better yet, just stick the new month in the middle of the calendar, but don't rename the months that have numbers in their name. It already worked once (thanks, Romans).
Why not just use Tredecember since it the thirteenth month the twelfth month can become Duodecember and not december.