'Day' in the Bible

For ye remember, brethren, our labor and travail: working night and day, that we might not burden any of you, we preached unto you the gospel of God.

night and day praying exceedingly that we may see your face, and may perfect that which is lacking in your faith?

For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.

But ye, brethren, are not in darkness, that that day should overtake you as a thief:

for ye are all sons of light, and sons of the day: we are not of the night, nor of darkness;

But let us, since we are of the day, be sober, putting on the breastplate of faith and love; and for a helmet, the hope of salvation.