Well, the Hijri date 27 Rabi Al Awwal 1409 corresponds to the Gregorian date Sunday, 6 November 1988. This date lies in the third month of the Hijri year 1409 AH, which is Rabi Al-Awwal of 1409 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1409/03/27 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 November 1988 to its equivalent Arabic date.
The following is the conversion of the Arabic date 27 Rabi Al Awwal 1409 AH to its equivalent Gregorian date.
لِّئَلَّا يَعْلَمَ أَهْلُ ٱلْكِتَٰبِ أَلَّا يَقْدِرُونَ عَلَىٰ شَىْءٍۢ مِّن فَضْلِ ٱللَّهِ ۙ وَأَنَّ ٱلْفَضْلَ بِيَدِ ٱللَّهِ يُؤْتِيهِ مَن يَشَآءُ ۚ وَٱللَّهُ ذُو ٱلْفَضْلِ ٱلْعَظِيمِ
That the People of the Scripture may know that they control naught of the bounty of Allah, but that the bounty is in Allah's hand to give to whom He will. And Allah is of Infinite Bounty.
Surah Al-Hadid(57:29)