The word(s) "day" appears 569 time(s) in 514 verse(s) in Quran in Abdullah Yusuf Ali translation.

(151) He has made subject to you the Night and the day; the sun and the moon; and the stars are in subjection by His Command: verily in this are Signs for men who are wise.

(152) Let them bear, on the day of Judgment, their own burdens in full, and also (something) of the burdens of those without knowledge, whom they misled. Alas, how grievous the burdens they will bear!

(153) Then, on the day of Judgment, He will cover them with shame, and say: "Where are My 'partners' concerning whom ye used to dispute (with the godly)?" Those endued with knowledge will say: "This day, indeed, are the Unbelievers covered with shame and misery,-

(154) (As if) to show their ingratitude for the favours we have bestowed on them! then enjoy (your brief day): but soon will ye know (your folly)!

(155) By Allah, We (also) sent (Our messengers) to Peoples before thee; but Satan made, (to the wicked), their own acts seem alluring: He is also their patron today, but they shall have a most grievous penalty.

(156) One day We shall raise from all Peoples a Witness: then will no excuse be accepted from Unbelievers, nor will they receive any favours.

(157) That day shall they (openly) show (their) submission to Allah; and all their inventions shall leave them in the lurch.

(158) One day We shall raise from all Peoples a witness against them, from amongst themselves: and We shall bring thee as a witness against these (thy people): and We have sent down to thee the Book explaining all things, a Guide, a Mercy, and Glad Tidings to Muslims.

(159) And be not like a woman who breaks into untwisted strands the yarn which she has spun, after it has become strong. Nor take your oaths to practise deception between yourselves, lest one party should be more numerous than another: for Allah will test you by this; and on the day of Judgment He will certainly make clear to you (the truth of) that wherein ye disagree.

(160) One day every soul will come up struggling for itself, and every soul will be recompensed (fully) for all its actions, and none will be unjustly dealt with.