Well, the Hijri date 18 Shaban 1373 corresponds to the Gregorian date Wednesday, 21 April 1954. This date lies in the eighth month of the Hijri year 1373 AH, which is Shaban of 1373 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1373/08/18 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 21 April 1954 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Shaban 1373 AH to its equivalent Gregorian date.
ٱلسَّمَآءُ مُنفَطِرٌۢ بِهِۦ ۚ كَانَ وَعْدُهُۥ مَفْعُولًا
The very heaven being then rent asunder. His promise is to be fulfilled.
Surah Al-Muzzammil(73:18)
Sahih al-Bukhari
Invocations
Chapter: To invoke for Allah's Blessings upon the children
Narrated As-Sa'ib bin Yazid:
My aunt took me to Allah's Messenger (ﷺ) and said, "O Allah's Messenger (ﷺ)! My sister's son is sick." So he passed his hand over my head and invoked for Allah's blessing upon me and then performed the ablution. I drank from the water of his ablution and I stood behind him and looked at his Khatam (the seal of Prophethood) between his shoulders (and its size was) like the button of a tent.
Sahih al-Bukhari 6352