The phrase "in the midst of the years" occurs in some more literal translations of Habakkuk 3:2:
Yahweh, I have heard the report of you, and your work, Yahweh, do I fear. In the midst of the years revive it; in the midst of the years make it known; in wrath remember mercy. (~ESV)
Is this a Hebrew idiom? What does it mean? Does it indicate something about the prophet's perception of himself in the flow of human history? Is the NIV rendering appropriate?—
Renew them in our day, in our time make them known; in wrath remember mercy.