Well, the Hijri date 11 Safar 1240 corresponds to the Gregorian date Monday, 4 October 1824. This date lies in the second month of the Hijri year 1240 AH, which is Safar of 1240 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1240/02/11 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 4 October 1824 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Safar 1240 AH to its equivalent Gregorian date.
أَمْ يَقُولُونَ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًۭا ۖ فَإِن يَشَإِ ٱللَّهُ يَخْتِمْ عَلَىٰ قَلْبِكَ ۗ وَيَمْحُ ٱللَّهُ ٱلْبَٰطِلَ وَيُحِقُّ ٱلْحَقَّ بِكَلِمَٰتِهِۦٓ ۚ إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
Or say they: He hath invented a lie concerning Allah? If Allah willed, He could have sealed thy heart (against them). And Allah will wipe out the lie and will vindicate the truth by His words. Lo! He is Aware of what is hidden in the breasts (of men).
Surah Ash-Shura(42:24)