Well, the Hijri date 9 Muharram 1342 corresponds to the Gregorian date Tuesday, 21 August 1923. This date lies in the first month of the Hijri year 1342 AH, which is Muharram of 1342 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1342/01/09 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 21 August 1923 to its equivalent Arabic date.
The following is the conversion of the Arabic date 9 Muharram 1342 AH to its equivalent Gregorian date.
فَإِنْ أَعْرَضُوا۟ فَقُلْ أَنذَرْتُكُمْ صَٰعِقَةًۭ مِّثْلَ صَٰعِقَةِ عَادٍۢ وَثَمُودَ
But if they turn away, then say: I warn you of a thunderbolt like the thunderbolt (which fell of old upon the tribes) of A'ad and Thamud;
Surah Fussilat(41:13)