'Weeks' in the Bible

'Seventy weeks are determined for thy people, and for thy holy city, to shut up the transgression, and to seal up sins, and to cover iniquity, and to bring in righteousness age-during, and to seal up vision and prophet, and to anoint the holy of holies.

And thou dost know, and dost consider wisely, from the going forth of the word to restore and to build Jerusalem till Messiah the Leader is seven weeks, and sixty and two weeks: the broad place hath been built again, and the rampart, even in the distress of the times.

And after the sixty and two weeks, cut off is Messiah, and the city and the holy place are not his, the Leader who hath come doth destroy the people; and its end is with a flood, and till the end is war, determined are desolations.

'In those days, I, Daniel, have been mourning three weeks of days;

desirable bread I have not eaten, and flesh and wine hath not come in unto my mouth, and I have not anointed myself at all, till the completion of three weeks of days.