﴿ يَوْمَئِذٍۢ تُحَدِّثُ أَخْبَارَهَا ﴾

“on that Day will she recount all her tidings,”

On that day yawma’idhin substitutes for and is the response to idhā ‘when’ it shall relate its chronicles it shall inform of the good and evil deeds committed in it