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

(251) So he saw the morning in the city, looking about, in a state of fear, when behold, the man who had, the day before, sought his help called aloud for his help (again). Moses said to him: "Thou art truly, it is clear, a quarrelsome fellow!"

(252) Then, when he decided to lay hold of the man who was an enemy to both of them, that man said: "O Moses! Is it thy intention to slay me as thou slewest a man yesterday? Thy intention is none other than to become a powerful violent man in the land, and not to be one who sets things right!"

(253) And we made them (but) leaders inviting to the Fire; and on the day of Judgment no help shall they find.

(254) in this world We made a curse to follow them and on the day of Judgment they will be among the loathed (and despised).

(255) Are (these two) alike?- one to whom We have made a goodly promise, and who is going to reach its (fulfilment), and one to whom We have given the good things of this life, but who, on the day of Judgment, is to be among those brought up (for punishment)?

(256) That day (Allah) will call to them, and say "Where are my 'partners'?- whom ye imagined (to be such)?"

(257) That day (Allah) will call to them, and say: "What was the answer ye gave to the messengers?"

(258) Then the (whole) story that day will seem obscure to them (like light to the blind) and they will not be able (even) to question each other.

(259) Say: See ye? If Allah were to make the night perpetual over you to the day of Judgment, what god is there other than Allah, who can give you enlightenment? Will ye not then hearken?

(260) Say: See ye? If Allah were to make the day perpetual over you to the day of Judgment, what god is there other than Allah, who can give you a night in which ye can rest? Will ye not then see?