Well, the Hijri date 15 Shawwal 1378 corresponds to the Gregorian date Thursday, 23 April 1959. This date lies in the tenth month of the Hijri year 1378 AH, which is Shawwal of 1378 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1378/10/15 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 23 April 1959 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Shawwal 1378 AH to its equivalent Gregorian date.
خِتَٰمُهُۥ مِسْكٌۭ ۚ وَفِى ذَٰلِكَ فَلْيَتَنَافَسِ ٱلْمُتَنَٰفِسُونَ
Whose seal is musk - for this let (all) those strive who strive for bliss -
Surah Al-Mutaffifin(83:26)
Sahih al-Bukhari
Hajj (Pilgrimage)
Chapter: "... And whosoever perfoms the 'Umra in the months of Hajj before the Hajj ..."
Narrated Abu Jamra:
I asked Ibn `Abbas about Hajj-at-Tamattu`. He ordered me to perform it. I asked him about the Hadi (sacrifice). He said, "You have to slaughter a camel, a cow or a sheep, or you may share the Hadi with the others." It seemed that some people disliked it (Hajj-at-Tamattu`). I slept and dreamt as if a person was announcing: "Hajj Mabrur and accepted Mut'ah (Hajj-at-Tamattu`)" I went to Ibn `Abbas and narrated it to him. He said, "Allah is Greater. (That was) the tradition of Abu Al-Qasim (i.e. Prophet). Narrated Shu`ba that the call in the dream was. "An accepted `Umra and Hajj-Mabrur. "
Sahih al-Bukhari 1688