Well, the Hijri date 20 Jumada Al Oula 1181 corresponds to the Gregorian date Tuesday, 13 October 1767. This date lies in the fifth month of the Hijri year 1181 AH, which is Jumada Al-Awwal of 1181 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1181/05/20 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 October 1767 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Jumada Al Oula 1181 AH to its equivalent Gregorian date.
وَهُوَ ٱلَّذِى يُرْسِلُ ٱلرِّيَٰحَ بُشْرًۢا بَيْنَ يَدَىْ رَحْمَتِهِۦ ۖ حَتَّىٰٓ إِذَآ أَقَلَّتْ سَحَابًۭا ثِقَالًۭا سُقْنَٰهُ لِبَلَدٍۢ مَّيِّتٍۢ فَأَنزَلْنَا بِهِ ٱلْمَآءَ فَأَخْرَجْنَا بِهِۦ مِن كُلِّ ٱلثَّمَرَٰتِ ۚ كَذَٰلِكَ نُخْرِجُ ٱلْمَوْتَىٰ لَعَلَّكُمْ تَذَكَّرُونَ
And He it is Who sendeth the winds as tidings heralding His mercy, till, when they bear a cloud heavy (with rain), We lead it to a dead land, and then cause water to descend thereon and thereby bring forth fruits of every kind. Thus bring We forth the dead. Haply ye may remember.
Surah Al-A'raaf(7:57)