Well, the Hijri date 12 Muharram 1405 corresponds to the Gregorian date Sunday, 7 October 1984. This date lies in the first month of the Hijri year 1405 AH, which is Muharram of 1405 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1405/01/12 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 7 October 1984 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Muharram 1405 AH to its equivalent Gregorian date.
وَمَآ أَرْسَلْنَا فِى قَرْيَةٍۢ مِّن نَّذِيرٍ إِلَّا قَالَ مُتْرَفُوهَآ إِنَّا بِمَآ أُرْسِلْتُم بِهِۦ كَٰفِرُونَ
And We sent not unto any township a warner, but its pampered ones declared: Lo! we are disbelievers in that wherewith ye have been sent.
Surah Saba(34:34)