'Year' in the Bible

And it came to pass, after the year was expired, at the time when kings go forth to battle, that David sent Joab, and his servants with him, and all Israel; and they destroyed the children of Ammon, and besieged Rabbah. But David tarried still at Jerusalem.

When he shaved his head—he shaved it every year because his hair got so heavy for him that he had to shave it off—he would weigh the hair from his head and it would be five pounds according to the royal standard.

Then there was a famine in the days of David three years, year after year; and David inquired of the LORD. And the LORD answered, It is for Saul, and for his bloody house, because he slew the Gibeonites.