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

(491) He said: "O my Lord! Verily, I have called to my people night and day (i.e. secretly and openly to accept the doctrine of Islamic Monotheism),

(492) Afterwards He will return you into it (the earth), and bring you forth (again on the day of Resurrection)?

(493) Verily, there is for you by day prolonged occupation with ordinary duties.

(494) On the day when the earth and the mountains will be in violent shake, and the mountains will be a heap of sand poured out.

(495) Then how can you avoid the punishment, if you disbelieve, on a day (i.e. the day of Resurrection) that will make the children grey-headed?

(496) Verily, your Lord knows that you do stand (to pray at night) a little less than two thirds of the night, or half the night, or a third of the night, and also a party of those with you. And Allah measures the night and the day. He knows that you are unable to pray the whole night, so He has turned to you (in mercy). So, recite you of the Qur'an as much as may be easy for you. He knows that there will be some among you sick, others travelling through the land, seeking of Allah's Bounty, yet others fighting in Allah's Cause. So recite as much of the Qur'an as may be easy (for you), and perform As-Salat (Iqamat-as-Salat ) and give Zakat, and lend to Allah a goodly loan. And whatever good you send before you for yourselves (i.e. Nawafil non-obligatory acts of worship: prayers, charity, fasting, Hajj and 'Umrah), you will certainly find it with Allah, better and greater in reward. And seek Forgiveness of Allah. Verily, Allah is Oft-Forgiving, Most-Merciful .

(497) Truly, that day will be a Hard day -

(498) Verily, it (Hell, or their denial of Prophet Muhammad صلى الله عليه وسلم, or the day of Resurrection) is but one of the greatest (signs).

(499) And we used to belie the day of Recompense,

(500) I swear by the day of Resurrection.