https://www.hebcal.com/holidays/chanukah-2023
On the Jewish calendar, which relies on lunar months that last either 29 or 30 days, Hanukkah begins on the same night every year: the 25th of the month of Kislev. But the Jewish calendar doesn’t quite line up with the secular, solar-based Gregorian calendar. As a result of a differentiation in calendar systems, Hanukkah’s start date in the United States fluctuates wildly year to year, falling anywhere between November 27 and December 26 on the Gregorian calendar.