Well, the Hijri date 13 Muharram 1340 corresponds to the Gregorian date Thursday, 15 September 1921. This date lies in the first month of the Hijri year 1340 AH, which is Muharram of 1340 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1340/01/13 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 15 September 1921 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Muharram 1340 AH to its equivalent Gregorian date.
مَثَلُ ٱلَّذِينَ ٱتَّخَذُوا۟ مِن دُونِ ٱللَّهِ أَوْلِيَآءَ كَمَثَلِ ٱلْعَنكَبُوتِ ٱتَّخَذَتْ بَيْتًۭا ۖ وَإِنَّ أَوْهَنَ ٱلْبُيُوتِ لَبَيْتُ ٱلْعَنكَبُوتِ ۖ لَوْ كَانُوا۟ يَعْلَمُونَ
The likeness of those who choose other patrons than Allah is as the likeness of the spider when she taketh unto herself a house, and lo! the frailest of all houses is the spider's house, if they but knew.
Surah Al-Ankaboot(29:41)