Well, the Hijri date 18 Muharram 1142 corresponds to the Gregorian date Friday, 12 August 1729. This date lies in the first month of the Hijri year 1142 AH, which is Muharram of 1142 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1142/01/18 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 12 August 1729 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Muharram 1142 AH to its equivalent Gregorian date.
قُلْ أَنزَلَهُ ٱلَّذِى يَعْلَمُ ٱلسِّرَّ فِى ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ ۚ إِنَّهُۥ كَانَ غَفُورًۭا رَّحِيمًۭا
Say (unto them, O Muhammad): He who knoweth the secret of the heavens and the earth hath revealed it. Lo! He ever is Forgiving, Merciful.
Surah Al-Furqaan(25:6)