I'd say Tevet if you only count Rosh Hashanah as beginning the year. If you go with all the halachic new years this gets a little more complicated.
Matt Sicker מתן בן פטר (WIP) (babka.social)Matt Sicker מתן בן פטר (WIP) (babka.social)Matt Sicker מתן בן פטר (WIP) (babka.social)