أَيَّانَ يَوْمُ الدِّينِ
When is the Day of Judgment?
In this Qurʾānic expression, ayyān is attached to the timing of an immense future event. Yawm al-dīn identifies the event whose time is at issue.
Magnification (tafkhīm) emphasizes the importance and gravity of the event. Nevertheless the appearance of ayyān does not automatically settle whether a passage literally seeks information; the context establishes whether the wording serves genuine inquiry or an additional rhetorical purpose.