Well, the Hijri date 18 Muharram 1217 corresponds to the Gregorian date Thursday, 20 May 1802. This date lies in the first month of the Hijri year 1217 AH, which is Muharram of 1217 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1217/01/18 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 May 1802 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Muharram 1217 AH to its equivalent Gregorian date.
مَا كَانَ لِبَشَرٍ أَن يُؤْتِيَهُ ٱللَّهُ ٱلْكِتَٰبَ وَٱلْحُكْمَ وَٱلنُّبُوَّةَ ثُمَّ يَقُولَ لِلنَّاسِ كُونُوا۟ عِبَادًۭا لِّى مِن دُونِ ٱللَّهِ وَلَٰكِن كُونُوا۟ رَبَّٰنِيِّۦنَ بِمَا كُنتُمْ تُعَلِّمُونَ ٱلْكِتَٰبَ وَبِمَا كُنتُمْ تَدْرُسُونَ
It is not (possible) for any human being unto whom Allah had given the Scripture and wisdom and the prophethood that he should afterwards have said unto mankind: Be slaves of me instead of Allah; but (what he said was): Be ye faithful servants of the Lord by virtue of your constant teaching of the Scripture and of your constant study thereof.
Surah Aal-i-Imraan(3:79)
