Esther 2:16

the tenth month, which is the month Tebeth In the time of the Babylonish exile the months ceased to be called by the old Canaanitish names which the Jews had previously given them, e.g. Abib (Exodus 13:4), Ziv (1 Kings 6:1), and were denoted by numbers only. After the exile the new Babylonish names, of which Tebeth is one, began to come into use. The name does not occur elsewhere in the Old Testament. It corresponded to the latter part of December and earlier part of January, and is derived from a Babylonian root tebu, which appears also in Hebrew, and means to sinkor dip, referring to the rainfall by which it is characterised.

in the seventh year of his reign probably in January, b.c. 479. Xerxes had at that time lately returned from his ill-starred expedition against Greece.