Surah An-Nazi'at 79:42

يَسْـَٔلُونَكَ عَنِ ٱلسَّاعَةِ أَيَّانَ مُرْسَىٰهَا

They ask you, [O Muḥammad], about the Hour: when is its arrival?

Translation: Saheeh International

Tafsir

They that is the disbelievers of Mecca will ask you about the Hour when will it set in? when will it come to pass and when will it begin?

Excerpt from Tafsir al-Jalalayn, commentary on 79:42, via Quran.com. The reader has the full commentary and 9 more tafsirs.