Well, the Hijri date 14 Muharram 1138 corresponds to the Gregorian date Friday, 21 September 1725. This date lies in the first month of the Hijri year 1138 AH, which is Muharram of 1138 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1138/01/14 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 21 September 1725 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Muharram 1138 AH to its equivalent Gregorian date.
إِن تَجْتَنِبُوا۟ كَبَآئِرَ مَا تُنْهَوْنَ عَنْهُ نُكَفِّرْ عَنكُمْ سَيِّـَٔاتِكُمْ وَنُدْخِلْكُم مُّدْخَلًۭا كَرِيمًۭا
If ye avoid the great (things) which ye are forbidden, We will remit from you your evil deeds and make you enter at a noble gate.
Surah An-Nisaa(4:31)