Well, the Hijri date 27 Rabi Al Thani 1405 corresponds to the Gregorian date Friday, 18 January 1985. This date lies in the fourth month of the Hijri year 1405 AH, which is Rabi Al-Thani of 1405 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1405/04/27 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 18 January 1985 to its equivalent Arabic date.
The following is the conversion of the Arabic date 27 Rabi Al Thani 1405 AH to its equivalent Gregorian date.
أَفَمَنْ هُوَ قَآئِمٌ عَلَىٰ كُلِّ نَفْسٍۭ بِمَا كَسَبَتْ ۗ وَجَعَلُوا۟ لِلَّهِ شُرَكَآءَ قُلْ سَمُّوهُمْ ۚ أَمْ تُنَبِّـُٔونَهُۥ بِمَا لَا يَعْلَمُ فِى ٱلْأَرْضِ أَم بِظَٰهِرٍۢ مِّنَ ٱلْقَوْلِ ۗ بَلْ زُيِّنَ لِلَّذِينَ كَفَرُوا۟ مَكْرُهُمْ وَصُدُّوا۟ عَنِ ٱلسَّبِيلِ ۗ وَمَن يُضْلِلِ ٱللَّهُ فَمَا لَهُۥ مِنْ هَادٍۢ
Is He Who is aware of the deserts of every soul (as he who is aware of nothing)? Yet they ascribe unto Allah partners. Say: Name them. Is it that ye would inform Him of something which He knoweth not in the earth? Or is it but a way of speaking? Nay but their contrivance is made seeming fair for those who disbelieve and they are kept from the right road. He whom Allah sendeth astray, for him there is no guide.
Surah Ar-Ra'd(13:33)