'Day' in the Bible

I thank God, whom I serve with a pure conscience--as my forefathers did--that night and day I unceasingly remember you in my prayers,

That indeed is the reason why I suffer as I do. But I am not ashamed, for I know in whom my trust reposes, and I am confident that He has it in His power to keep what I have entrusted to Him safe until that day.

From this time onward there is reserved for me the crown of righteousness which the Lord, the righteous Judge, will award to me on that day, and not only to me, but also to all who love the thought of His Appearing.