'Year' in the Bible

In the spring of the year, at the time when kings normally conduct wars, David sent out Joab with his officers and the entire Israelite army. They defeated the Ammonites and besieged Rabbah. But David stayed behind in Jerusalem.

When he would shave his head -- at the end of every year he used to shave his head, for it grew too long and he would shave it -- he used to weigh the hair of his head at three pounds according to the king's weight.