Say, “You have a specific time, on a specific day, that you cannot delay by one hour, nor advance.”
قُل لَكُم ميعادُ يَومٍ لا تَستَـٔخِرونَ عَنهُ ساعَةً وَلا تَستَقدِمونَ
qul lakum mee’aadu Yawmil laa tasta’khiroona ‘anhu saa’atanw wa laa tastaqdimoon