Well, the Hijri date 16 Rajab 1370 corresponds to the Gregorian date Sunday, 22 April 1951. This date lies in the seventh month of the Hijri year 1370 AH, which is Rajab of 1370 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1370/07/16 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 22 April 1951 to its equivalent Arabic date.
The following is the conversion of the Arabic date 16 Rajab 1370 AH to its equivalent Gregorian date.
ثُمَّ كَلَّا سَيَعْلَمُونَ
Nay, again, but they will come to know!
Surah An-Naba(78:5)
Sahih al-Bukhari
Fasting
Chapter: Observing Saum (fast) on the day of 'Ashura.
Narrated Abu Musa:
The day of 'Ashura' was considered as `Id day by the Jews. So the Prophet (ﷺ) ordered, "I recommend you (Muslims) to fast on this day."
Sahih al-Bukhari 2005