Well, the Hijri date 18 Muharram 1233 corresponds to the Gregorian date Thursday, 27 November 1817. This date lies in the first month of the Hijri year 1233 AH, which is Muharram of 1233 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1233/01/18 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 27 November 1817 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Muharram 1233 AH to its equivalent Gregorian date.
وَمَن يُشَاقِقِ ٱلرَّسُولَ مِنۢ بَعْدِ مَا تَبَيَّنَ لَهُ ٱلْهُدَىٰ وَيَتَّبِعْ غَيْرَ سَبِيلِ ٱلْمُؤْمِنِينَ نُوَلِّهِۦ مَا تَوَلَّىٰ وَنُصْلِهِۦ جَهَنَّمَ ۖ وَسَآءَتْ مَصِيرًا
And whoso opposeth the messenger after the guidance (of Allah) hath been manifested unto him, and followeth other than the believer's way, We appoint for him that unto which he himself hath turned, and expose him unto hell - a hapless journey's end!
Surah An-Nisaa(4:115)