Well, the Hijri date 29 Rajab 1237 corresponds to the Gregorian date Saturday, 20 April 1822. This date lies in the seventh month of the Hijri year 1237 AH, which is Rajab of 1237 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1237/07/29 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 April 1822 to its equivalent Arabic date.
The following is the conversion of the Arabic date 29 Rajab 1237 AH to its equivalent Gregorian date.
ذَٰلِكَ بِأَنَّهُمْ شَآقُّوا۟ ٱللَّهَ وَرَسُولَهُۥ ۚ وَمَن يُشَاقِقِ ٱللَّهَ وَرَسُولَهُۥ فَإِنَّ ٱللَّهَ شَدِيدُ ٱلْعِقَابِ
That is because they opposed Allah and His messenger. Whoso opposeth Allah and His messenger, (for him) lo! Allah is severe in punishment.
Surah Al-Anfaal(8:13)