On which date are the Maghrib and Isha prayers offered together at Muzdalifah during Hajj?

On which date are the Maghrib and Isha prayers offered together at Muzdalifah during Hajj?

حج کے دوران مزدلفہ میں مغرب اور عشاء کی نمازیں کس تاریخ کو ایک ساتھ ادا کی جاتی ہیں؟
Explanation
The Maghrib and Isha prayers are combined and offered together at Muzdalifah on the 9th Zil-ul-Hajj, after pilgrims leave Arafat at sunset.
This is a significant step in the Hajj rituals.