Well, the Hijri date 15 Rajab 1370 corresponds to the Gregorian date Saturday, 21 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 Saturday without any doubt. The Arabic date 1370/07/15 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 1951 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Rajab 1370 AH to its equivalent Gregorian date.
وَلَقَدِ ٱسْتُهْزِئَ بِرُسُلٍۢ مِّن قَبْلِكَ فَحَاقَ بِٱلَّذِينَ سَخِرُوا۟ مِنْهُم مَّا كَانُوا۟ بِهِۦ يَسْتَهْزِءُونَ
Messengers before thee, indeed, were mocked, but that whereat they mocked surrounded those who scoffed at them.
Surah Al-Anbiyaa(21:41)
Sahih al-Bukhari
Retiring to a Mosque for Remembrance of Allah (I'tikaf)
Chapter: Whoever went out of his I'tikaf in the morning
Narrated Abu Sa`id:
We practiced I`tikaf with Allah's Messenger (ﷺ) in the middle ten days (of Ramadan). In the morning of the twentieth (of Ramadan) we shifted our baggage, but Allah's Messenger (ﷺ) came to us and said, "Whoever was m I`tikaf should return to his place of I`tikaf, for I saw (i.e. was informed about the date of) this Night (of Qadr) and saw myself prostrating in mud and water." When I returned to my place the sky was overcast with clouds and it rained. By Him Who sent Muhammad with the Truth, the sky was covered with clouds from the end of that day, and the mosque which was roofed with leafstalks of date palm trees (leaked with rain) and I saw the trace of mud and water over the nose of the Prophet (ﷺ) and its tip.
Sahih al-Bukhari 2040