Well, the Hijri date 21 Dhul Qidah 1406 corresponds to the Gregorian date Monday, 28 July 1986. This date lies in the eleventh month of the Hijri year 1406 AH, which is Dhu Al-Qidah of 1406 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1406/11/21 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 28 July 1986 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Dhul Qidah 1406 AH to its equivalent Gregorian date.
وَمَن جَآءَ بِٱلسَّيِّئَةِ فَكُبَّتْ وُجُوهُهُمْ فِى ٱلنَّارِ هَلْ تُجْزَوْنَ إِلَّا مَا كُنتُمْ تَعْمَلُونَ
And whoso bringeth an ill-deed, such will be flung down on their faces in the Fire. Are ye rewarded aught save what ye did?
Surah An-Naml(27:90)