The International Fixed Calendar [en.m.wikipedia.org], designed by Moses B. Cotsworth and presented in 1902, has 13 months. The new month -Sol - is inserted between June and July. If need be we can use this calendar since December 3rd would be 13-3.

I couldn't find a 14 month calendar. If the Rams go 14-2 we're screwed, date-wise.

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AlbaNY_Ram