Well, the Hijri date 20 Rajab 1243 corresponds to the Gregorian date Tuesday, 5 February 1828. This date lies in the seventh month of the Hijri year 1243 AH, which is Rajab of 1243 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1243/07/20 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 5 February 1828 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rajab 1243 AH to its equivalent Gregorian date.
أَمْ يَقُولُونَ ٱفْتَرَىٰهُ ۖ قُلْ إِنِ ٱفْتَرَيْتُهُۥ فَلَا تَمْلِكُونَ لِى مِنَ ٱللَّهِ شَيْـًٔا ۖ هُوَ أَعْلَمُ بِمَا تُفِيضُونَ فِيهِ ۖ كَفَىٰ بِهِۦ شَهِيدًۢا بَيْنِى وَبَيْنَكُمْ ۖ وَهُوَ ٱلْغَفُورُ ٱلرَّحِيمُ
Or say they: He hath invented it? Say (O Muhammad): If I have invented it, still ye have no power to support me against Allah. He is Best Aware of what ye say among yourselves concerning it. He sufficeth for a witness between me and you. And He is the Forgiving, the Merciful.
Surah Al-Ahqaf(46:8)