'First Day' in the Bible

From the first day of the seventh month, began they to offer up ascending-sacrifices unto Yahweh, - but, the temple of Yahweh, had not had its foundation laid.

But the Sons of the Exile, did thus, and Ezra the priest separated to himself certain men - ancestral heads by their ancestral houses, and all of them by name, - and they took their seats on the first day of the tenth month to search into the matter;

and they made an end with all the men who had married foreign women, - by the first day of the first month.