'Day' in the Bible

For ye remember, brethren, our labour and travail: for labouring night and day, because we would not be chargeable unto any of you, we preached unto you the gospel of God.

Night and day praying exceedingly that we might see your face, and might 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.

Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.

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