Well, the Hijri date 21 Jumada Al Oula 1139 corresponds to the Gregorian date Monday, 13 January 1727. This date lies in the fifth month of the Hijri year 1139 AH, which is Jumada Al-Awwal of 1139 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1139/05/21 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 13 January 1727 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Jumada Al Oula 1139 AH to its equivalent Gregorian date.
ٱتَّبِعُوا۟ مَآ أُنزِلَ إِلَيْكُم مِّن رَّبِّكُمْ وَلَا تَتَّبِعُوا۟ مِن دُونِهِۦٓ أَوْلِيَآءَ ۗ قَلِيلًۭا مَّا تَذَكَّرُونَ
(Saying): Follow that which is sent down unto you from your Lord, and follow no protecting friends beside Him. Little do ye recollect!
Surah Al-A'raaf(7:3)