Well, the Hijri date 21 Jumada Al Oula 1158 corresponds to the Gregorian date Sunday, 20 June 1745. This date lies in the fifth month of the Hijri year 1158 AH, which is Jumada Al-Awwal of 1158 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1158/05/21 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 20 June 1745 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Jumada Al Oula 1158 AH to its equivalent Gregorian date.
قَدْ كَانَ لَكُمْ ءَايَةٌۭ فِى فِئَتَيْنِ ٱلْتَقَتَا ۖ فِئَةٌۭ تُقَٰتِلُ فِى سَبِيلِ ٱللَّهِ وَأُخْرَىٰ كَافِرَةٌۭ يَرَوْنَهُم مِّثْلَيْهِمْ رَأْىَ ٱلْعَيْنِ ۚ وَٱللَّهُ يُؤَيِّدُ بِنَصْرِهِۦ مَن يَشَآءُ ۗ إِنَّ فِى ذَٰلِكَ لَعِبْرَةًۭ لِّأُو۟لِى ٱلْأَبْصَٰرِ
There was a token for you in two hosts which met: one army fighting in the way of Allah, and another disbelieving, whom they saw as twice their number, clearly, with their very eyes. Thus Allah strengtheneth with His succour whom He will. Lo! herein verily is a lesson for those who have eyes.
Surah Aal-i-Imraan(3:13)