(37:21) [They will be told], “This is the Day of Judgement which you used to deny.”
Muhammad Taqi-ud-Din al-Hilali and Muhammad Muhsin Khan,
(37:21) (It will be said): “This is the Day of Judgement which you used to deny.”
Mohammed Marmaduke William Pickthall
(37:21) This is the Day of Separation, which ye used to deny.
Abdullah Yusuf Ali
(37:21) (A voice will say,) “This is the Day of Sorting Out, whose truth ye (once) denied!”
Mohammad Habib Shakir
(37:21) This is the day of the judgment which you called a lie.
Dr. Ghali
(37:21) This is the Day of Verdict, which you used to cry lies to.
Ali Unal
(37:21) (And it is said): “This is the Day of Judgment and Distinction (between truth and falsehood, between the righteous and the sinful the Day) that you used to deny.”
Amatul Rahman Omar
(37:21) (They will be told,) `This is the Day of the (last) judgment, (yes) the very day you used to cry lies to.´
Literal
(37:21) That (is) the Judgment Day/Separation Day/Resurrection Day which you were with it lying/denying/falsifying.
Ahmed Ali
(37:21) (Yes,) this is the Day of Judgement you had called a lie.
A. J. Arberry
(37:21) This is the Day of Decision, even that you cried lies to.
Abdul Majid Daryabadi
(37:21) This is the Day of Judgment which ye were wont to belie.
Maulana Mohammad Ali
(37:21)-
Muhammad Sarwar
(37:21) This is the Day of Judgment in which you disbelieved.
Hamid Abdul Aziz
(37:21) (A voice will say,) “This is the Day of the Judgment which you called a lie.
Faridul Haque
(37:21) This is the Day of Judgement, which you used to deny!
Talal Itani
(37:21) This is the Day of Separation which you used to deny.
Ahmed Raza Khan
(37:21) This is the Day of Judgement, which you used to deny!
Wahiduddin Khan
(37:21) [It will be said], “This is the Day of Judgement which you have been denying.”
Safi-ur-Rahman al-Mubarakpuri
(37:21) (It will be said:) “This is the Day of Judgement which you used to deny.”
Ali Quli Qarai
(37:21) This is the Day of Judgement that you used to deny!
Hasan al-Fatih Qaribullah and Ahmad Darwish
(37:21) This is the Day of Decision which you belied.
That is translated surah As Saffat ayat 21 (QS 37: 21) in arabic and english text, may be useful.