'Month' in the Bible

It happened in the fortieth year, in the eleventh month, on the first day of the month, that Moses spoke to the children of Israel, according to all that Yahweh had given him in commandment to them;

Observe the month of Abib, and keep the Passover to Yahweh your God; for in the month of Abib Yahweh your God brought you forth out of Egypt by night.

and she shall put the clothing of her captivity from off her, and shall remain in your house, and bewail her father and her mother a full month: and after that you shall go in to her, and be her husband, and she shall be your wife.