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

(341) Those in the Fire will say to the Keepers of Hell: "Pray to your Lord to lighten us the Penalty for a day (at least)!"

(342) We will, without doubt, help our messengers and those who believe, (both) in this world's life and on the day when the Witnesses will stand forth,-

(343) The day when no profit will it be to Wrong-doers to present their excuses, but they will (only) have the Curse and the Home of Misery.

(344) It is Allah Who has made the Night for you, that ye may rest therein, and the days as that which helps (you) to see. Verily Allah is full of Grace and Bounty to men: yet most men give no thanks.

(345) Say: Is it that ye deny Him Who created the earth in two days? And do ye join equals with Him? He is the Lord of (all) the Worlds.

(346) He set on the (earth), mountains standing firm, high above it, and bestowed blessings on the earth, and measure therein all things to give them nourishment in due proportion, in four days, in accordance with (the needs of) those who seek (Sustenance).

(347) So He completed them as seven firmaments in two days, and He assigned to each heaven its duty and command. And We adorned the lower heaven with lights, and (provided it) with guard. Such is the Decree of (Him) the Exalted in Might, Full of Knowledge.

(348) So We sent against them a furious Wind through days of disaster, that We might give them a taste of a Penalty of humiliation in this life; but the Penalty of a Hereafter will be more humiliating still: and they will find no help.

(349) On the day that the enemies of Allah will be gathered together to the Fire, they will be marched in ranks.

(350) Among His Signs are the Night and the day, and the Sun and the Moon. Do not prostrate to the sun and the moon, but prostrate to Allah, Who created them, if it is Him ye wish to serve.