Well, the Hijri date 18 Muharram 1438 corresponds to the Gregorian date Wednesday, 19 October 2016. This date lies in the first month of the Hijri year 1438 AH, which is Muharram of 1438 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1438/01/18 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 19 October 2016 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Muharram 1438 AH to its equivalent Gregorian date.
فَإِنِ ٱسْتَكْبَرُوا۟ فَٱلَّذِينَ عِندَ رَبِّكَ يُسَبِّحُونَ لَهُۥ بِٱلَّيْلِ وَٱلنَّهَارِ وَهُمْ لَا يَسْـَٔمُونَ ۩
But if they are too proud - still those who are with thy Lord glorify Him night and day, and tire not.
Surah Fussilat(41:38)