The word(s) "day" appears 704 time(s) in 579 verse(s) in Quran in Mohsin Khan translation.

(261) Allah causes the night and the day to succeed each other (i.e. if the day is gone, the night comes, and if the night is gone, the day comes, and so on). Truly, in this is indeed a lesson for those who have insight.

(262) O you who believe! Let your slaves and slave-girls, and those among you who have not come to the age of puberty ask your permission (before they come to your presence) on three occasions: before Fajr (morning) Salat (prayer), and while you put off your clothes for the noonday (rest), and after the 'Isha' (late-night) Salat (prayer). (These) three times are of privacy for you; other than these times there is no sin on you or on them to move about, attending to each other. Thus Allah makes clear the Ayat (the Verses of this Qur'an, showing proofs for the legal aspects of permission for visits) to you. And Allah is All-Knowing, All-Wise.

(263) Certainly, to Allah belongs all that is in the heavens and the earth. Surely, He knows your condition and (He knows) the day when they will be brought back to Him, then He will inform them of what they did. And Allah is All-Knower of everything.

(264) Nay, they deny the Hour (the day of Resurrection), and for those who deny the Hour, We have prepared a flaming Fire (i.e. Hell).

(265) Exclaim not today for one destruction, but exclaim for many destructions.

(266) And on the day when He will gather them together and that which they worship besides Allah [idols, angels, pious men, saints] . He will say: "Was it you who misled these My slaves or did they (themselves) stray from the (Right) Path?"

(267) And those who expect not a Meeting with Us (i.e. those who deny the day of Resurrection and the life of the Hereafter) said: "Why are not the angels sent down to us, or why do we not see our Lord?" Indeed they think too highly of themselves, and are scornful with great pride.

(268) On the day they will see the angels - no glad tidings will there be for the Mujrimun (criminals, disbelievers, polytheists, sinners) that day. And they (angels) will say: "All kinds of glad tidings are forbidden to you," [none will be allowed to enter Paradise except the one who said: La ilaha illallah, "(none has the right to be worshipped but Allah) and acted practically on its legal orders and obligations. See the footnote of V.2:193)].

(269) The dwellers of Paradise (i.e. those who deserved it through their Islamic Monotheistic Faith and their deeds of righteousness) will, on that day, have the best abode, and have the fairest of places for repose.

(270) And (remember) the day when the heaven shall be rent asunder with clouds, and the angels will be sent down, with a grand descending.