Well, the Hijri date 20 Rajab 1236 corresponds to the Gregorian date Sunday, 22 April 1821. This date lies in the seventh month of the Hijri year 1236 AH, which is Rajab of 1236 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1236/07/20 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 22 April 1821 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rajab 1236 AH to its equivalent Gregorian date.
أَلَمْ تَرَ أَنَّ ٱللَّهَ سَخَّرَ لَكُم مَّا فِى ٱلْأَرْضِ وَٱلْفُلْكَ تَجْرِى فِى ٱلْبَحْرِ بِأَمْرِهِۦ وَيُمْسِكُ ٱلسَّمَآءَ أَن تَقَعَ عَلَى ٱلْأَرْضِ إِلَّا بِإِذْنِهِۦٓ ۗ إِنَّ ٱللَّهَ بِٱلنَّاسِ لَرَءُوفٌۭ رَّحِيمٌۭ
Hast thou not seen how Allah hath made all that is in the earth subservient unto you? And the ship runneth upon the sea by His command, and He holdeth back the heaven from falling on the earth unless by His leave. Lo! Allah is, for mankind, Full of Pity, Merciful.
Surah Al-Hajj(22:65)