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

(361) So leave them to babble and play (with vanities) until they meet that day of theirs, which they have been promised.

(362) Then watch thou for the day that the sky will bring forth a kind of smoke (or mist) plainly visible,

(363) One day We shall seize you with a mighty onslaught: We will indeed (then) exact Retribution!

(364) Verily the day of sorting out is the time appointed for all of them,-

(365) The day when no protector can avail his client in aught, and no help can they receive,

(366) And in the alternation of Night and day, and the fact that Allah sends down Sustenance from the sky, and revives therewith the earth after its death, and in the change of the winds,- are Signs for those that are wise.

(367) Tell those who believe, to forgive those who do not look forward to the days of Allah: It is for Him to recompense (for good or ill) each People according to what they have earned.

(368) And We granted them Clear Signs in affairs (of Religion): it was only after knowledge had been granted to them that they fell into schisms, through insolent envy among themselves. Verily thy Lord will judge between them on the day of Judgment as to those matters in which they set up differences.

(369) Say: "It is Allah Who gives you life, then gives you death; then He will gather you together for the day of Judgment about which there is no doubt": But most men do not understand.

(370) To Allah belongs the dominion of the heavens and the earth, and the day that the Hour of Judgment is established,- that day will the dealers in Falsehood perish!