Tevet 10
Starts at the beginning of the day and ends at sundown on Friday, 25 December 2020 (10th of Tevet, 5781)
The 10th of Tevet on the Jewish calendar marks the beginning of the siege of Jerusalem by the armies of the Babylonian emperor, which led to the conquest of the city, the destruction of the Holy Temple and the expulsion of the people of Israel from their land.
Source chabad