Well, the Hijri date 13 Ramadan 1431 corresponds to the Gregorian date Monday, 23 August 2010. This date lies in the ninth month of the Hijri year 1431 AH, which is Ramadan of 1431 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1431/09/13 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 23 August 2010 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Ramadan 1431 AH to its equivalent Gregorian date.
فَذَرْنِى وَمَن يُكَذِّبُ بِهَٰذَا ٱلْحَدِيثِ ۖ سَنَسْتَدْرِجُهُم مِّنْ حَيْثُ لَا يَعْلَمُونَ
Leave Me (to deal) with those who give the lie to this pronouncement. We shall lead them on by steps from whence they know not.
Surah Al-Qalam(68:44)