Well, the Hijri date 28 Dhul Qidah 1240 corresponds to the Gregorian date Wednesday, 13 July 1825. This date lies in the eleventh month of the Hijri year 1240 AH, which is Dhu Al-Qidah of 1240 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1240/11/28 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 13 July 1825 to its equivalent Arabic date.
The following is the conversion of the Arabic date 28 Dhul Qidah 1240 AH to its equivalent Gregorian date.
ٱلَّذِينَ ءَاتَيْنَٰهُمُ ٱلْكِتَٰبَ يَعْرِفُونَهُۥ كَمَا يَعْرِفُونَ أَبْنَآءَهُمْ ۖ وَإِنَّ فَرِيقًۭا مِّنْهُمْ لَيَكْتُمُونَ ٱلْحَقَّ وَهُمْ يَعْلَمُونَ
Those unto whom We gave the Scripture recognise (this revelation) as they recognise their sons. But lo! a party of them knowingly conceal the truth.
Surah Al-Baqara(2:146)