Well, the Hijri date 12 Rajab 1139 corresponds to the Gregorian date Tuesday, 4 March 1727. This date lies in the seventh month of the Hijri year 1139 AH, which is Rajab of 1139 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1139/07/12 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 4 March 1727 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Rajab 1139 AH to its equivalent Gregorian date.
۞ وَمَا كَانَ لِبَشَرٍ أَن يُكَلِّمَهُ ٱللَّهُ إِلَّا وَحْيًا أَوْ مِن وَرَآئِ حِجَابٍ أَوْ يُرْسِلَ رَسُولًۭا فَيُوحِىَ بِإِذْنِهِۦ مَا يَشَآءُ ۚ إِنَّهُۥ عَلِىٌّ حَكِيمٌۭ
And it was not (vouchsafed) to any mortal that Allah should speak to him unless (it be) by revelation or from behind a veil, or (that) He sendeth a messenger to reveal what He will by His leave. Lo! He is Exalted, Wise.
Surah Ash-Shura(42:51)