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

(571) Then what (or who) causes you (O disbelievers) to deny the Recompense (i.e. the day of Resurrection)?

(572) That day it will declare its information (about all that happened over it of good or evil).

(573) That day mankind will proceed in scattered groups that they may be shown their deeds.

(574) Verily, that day (i.e. the day of Resurrection) their Lord will be Well-Acquainted with them (as to their deeds and will reward them for their deeds).

(575) Al-Qari'ah (the striking Hour i.e. the day of Resurrection).

(576) It is a day whereon mankind will be like moths scattered about.

(577) Then on that day you shall be asked about the delights (you indulged in, in this world)!

(578) Say: (O Muhammad صلى الله عليه وسلم to these Mushrikun and Kafirun): "O Al-Kafirun (disbelievers in Allah, in His Oneness, in His Angels, in His Books, in His Messengers, in the day of Resurrection, and in Al-Qadar)!

(579) Say: "I seek refuge with (Allah), the Lord of the daybreak,