Well, the Hijri date 18 Ramadan 1138 corresponds to the Gregorian date Sunday, 19 May 1726. This date lies in the ninth month of the Hijri year 1138 AH, which is Ramadan of 1138 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1138/09/18 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 19 May 1726 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Ramadan 1138 AH to its equivalent Gregorian date.
إِلَّا ٱمْرَأَتَهُۥ قَدَّرْنَآ ۙ إِنَّهَا لَمِنَ ٱلْغَٰبِرِينَ
Except his wife, of whom We had decreed that she should be of those who stay behind.
Surah Al-Hijr(15:60)