Rosh Chodesh Calendar 2024. Rosh chodesh, the head of the month, plays a big role in the jewish calendar, where the lunar cycle is front and center. Rosh chodesh kislev for hebrew year 5785 begins at sundown on saturday, 30 november 2024 and ends at nightfall on monday, 2 december 2024.

Rosh hashanah, the jewish new year, falls on the hebrew calendar dates of 1 and 2 tishrei. What is the jewish calendar based on?