Well, the Hijri date 18 Jumada Al Oula 1240 corresponds to the Gregorian date Friday, 7 January 1825. This date lies in the fifth month of the Hijri year 1240 AH, which is Jumada Al-Awwal of 1240 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1240/05/18 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 7 January 1825 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Jumada Al Oula 1240 AH to its equivalent Gregorian date.
هُوَ ٱلَّذِىٓ أَرْسَلَ رَسُولَهُۥ بِٱلْهُدَىٰ وَدِينِ ٱلْحَقِّ لِيُظْهِرَهُۥ عَلَى ٱلدِّينِ كُلِّهِۦ وَلَوْ كَرِهَ ٱلْمُشْرِكُونَ
He it is Who hath sent His messenger with the guidance and the religion of truth, that He may make it conqueror of all religion however much idolaters may be averse.
Surah As-Saff(61:9)