Well, the Hijri date 27 Rajab 1406 corresponds to the Gregorian date Sunday, 6 April 1986. This date lies in the seventh month of the Hijri year 1406 AH, which is Rajab of 1406 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1406/07/27 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 6 April 1986 to its equivalent Arabic date.
The following is the conversion of the Arabic date 27 Rajab 1406 AH to its equivalent Gregorian date.
وَمَا كَانَ لِمُؤْمِنٍۢ وَلَا مُؤْمِنَةٍ إِذَا قَضَى ٱللَّهُ وَرَسُولُهُۥٓ أَمْرًا أَن يَكُونَ لَهُمُ ٱلْخِيَرَةُ مِنْ أَمْرِهِمْ ۗ وَمَن يَعْصِ ٱللَّهَ وَرَسُولَهُۥ فَقَدْ ضَلَّ ضَلَٰلًۭا مُّبِينًۭا
And it becometh not a believing man or a believing woman, when Allah and His messenger have decided an affair (for them), that they should (after that) claim any say in their affair; and whoso is rebellious to Allah and His messenger, he verily goeth astray in error manifest.
Surah Al-Ahzaab(33:36)