Christ's glorious return to earth - at the end of the seven period called the "Day of the Lord" - that Almighty God will establish His 1000 year reign and rule on this earth. It will be at this time that absolutely no darkness will dominate as in days past. But until then, we are still present and in a spiritual war in this Demonic Complex which is presently governing world (Eph. 2:2, 6:12).
The Kingdom of Heaven is at hand!