'Day' in the Bible

for ye remember, brethren, our labour and travail, for, night and day working not to be a burden upon any of you, we did preach to you the good news of God;

night and day exceedingly beseeching, that we might see your face, and perfect the things lacking in your faith.

for yourselves have known thoroughly that the day of the Lord as a thief in the night doth so come,

and ye, brethren, are not in darkness, that the day may catch you as a thief;

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

and we, being of the day -- let us be sober, putting on a breastplate of faith and love, and an helmet -- a hope of salvation,