The Ides of October

Is anyone else bothered that the Ides of a Month is on the 15th of some months and the 13th of other months? It’s based on an old Roman calendar where months either had 31 days (Ides on the the 15th) or 29 (Ides on the 13th). I guess it makes the number of days after the Ides consistent (except for February, but screw February). They also did not fix it when they switched to 31 and 30-day months.

Internal consistency is not always required for your fantasy world. (But maybe be prepared to explain why.)

Anyway, happy Ides of October.