Well, the Hijri date 21 Rajab 1188 corresponds to the Gregorian date Monday, 26 September 1774. This date lies in the seventh month of the Hijri year 1188 AH, which is Rajab of 1188 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1188/07/21 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 26 September 1774 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rajab 1188 AH to its equivalent Gregorian date.
وَنَجَّيْنَٰهُ وَأَهْلَهُۥ مِنَ ٱلْكَرْبِ ٱلْعَظِيمِ
And We saved him and his household from the great distress,
Surah As-Saaffaat(37:76)
