The word(s) "day" appears 568 time(s) in 513 verse(s) in Quran in Muhammad Pickthal translation.

(71) Say: Unto whom belongeth whatsoever is in the heavens and the earth? Say: Unto Allah. He hath prescribed for Himself mercy, that He may bring you all together to the day of Resurrection whereof there is no doubt. Those who ruin their souls will not believe.

(72) Unto Him belongeth whatsoever resteth in the night and the day. He is the Hearer, the Knower.

(73) Say: I fear, if I rebel against my Lord, the retribution of an Awful day.

(74) He from whom (such retribution) is averted on that day, (Allah) hath in truth had mercy on him. That will be the signal triumph.

(75) And on the day We gather them together We shall say unto those who ascribed partners (unto Allah): Where are (now) those partners of your make-believe?

(76) He it is Who gathereth you at night and knoweth that which ye commit by day. Then He raiseth you again to life therein, that the term appointed (for you) may be accomplished. And afterward unto Him is your return. Then He will proclaim unto you what ye used to do.

(77) He it is Who created the heavens and the earth in truth. In the day when He saith: Be! it is. His Word is the Truth, and His will be the Sovereignty on the day when the trumpet is blown. Knower of the Invisible and the Visible, He is the Wise, the Aware.

(78) Who is guilty of more wrong than he who forgeth a lie against Allah, or saith: I am inspired, when he is not inspired in aught; and who saith: I will reveal the like of that which Allah hath revealed? If thou couldst see, when the wrong-doers reach the pangs of death and the angels stretch their hands out (saying): Deliver up your souls. This day ye are awarded doom of degradation for that ye spake concerning Allah other than the truth, and used to scorn His portents.

(79) He is the Cleaver of the daybreak, and He hath appointed the night for stillness, and the sun and the moon for reckoning. That is the measuring of the Mighty, the Wise.

(80) In the day when He will gather them together (He will say): O ye assembly of the jinn! Many of humankind did ye seduce. And their adherents among humankind will say: Our Lord! We enjoyed one another, but now we have arrived at the appointed term which Thou appointedst for us. He will say: Fire is your home. Abide therein for ever, save him whom Allah willeth (to deliver). Lo! thy Lord is Wise, Aware.