The word(s) "day" appears 568 time(s) in 513 verse(s) in Quran in Muhammad Pickthal translation.

(361) So let them flounder (in their talk) and play until they meet the day which they are promised.

(362) But watch thou (O Muhammad) for the day when the sky will produce visible smoke

(363) On the day when We shall seize them with the greater seizure, (then) in truth We shall punish.

(364) Assuredly the day of Decision is the term for all of them,

(365) A day when friend can in naught avail friend, nor can they be helped,

(366) And the difference of night and day and the provision that Allah sendeth down from the sky and thereby quickeneth the earth after her death, and the ordering of the winds, are portents for a people who have sense.

(367) Tell those who believe to forgive those who hope not for the days of Allah; in order that He may requite folk what they used to earn.

(368) And gave them plain commandments. And they differed not until after the knowledge came unto them, through rivalry among themselves. Lo! thy Lord will judge between them on the day of Resurrection concerning that wherein they used to differ.

(369) Say (unto them, O Muhammad): Allah giveth life to you, then causeth you to die, then gathereth you unto the day of Resurrection whereof there is no doubt. But most of mankind know not.

(370) And unto Allah belongeth the Sovereignty of the heavens and the earth; and on the day when the Hour riseth, on that day those who follow falsehood will be lost.