Well, the Hijri date 4 Shaban 1140 corresponds to the Gregorian date Monday, 15 March 1728. This date lies in the eighth month of the Hijri year 1140 AH, which is Shaban of 1140 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1140/08/04 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 15 March 1728 to its equivalent Arabic date.
The following is the conversion of the Arabic date 4 Shaban 1140 AH to its equivalent Gregorian date.
أَمْ ءَاتَيْنَٰهُمْ كِتَٰبًۭا مِّن قَبْلِهِۦ فَهُم بِهِۦ مُسْتَمْسِكُونَ
Or have We given them any scripture before (this Qur'an) so that they are holding fast thereto?
Surah Az-Zukhruf(43:21)