Well, the Hijri date 23 Dhul Hijjah 1378 corresponds to the Gregorian date Monday, 29 June 1959. This date lies in the twelfth month of the Hijri year 1378 AH, which is Dhu Al-Hijjah of 1378 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1378/12/23 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 29 June 1959 to its equivalent Arabic date.
The following is the conversion of the Arabic date 23 Dhul Hijjah 1378 AH to its equivalent Gregorian date.
سَنُرِيهِمْ ءَايَٰتِنَا فِى ٱلْءَافَاقِ وَفِىٓ أَنفُسِهِمْ حَتَّىٰ يَتَبَيَّنَ لَهُمْ أَنَّهُ ٱلْحَقُّ ۗ أَوَلَمْ يَكْفِ بِرَبِّكَ أَنَّهُۥ عَلَىٰ كُلِّ شَىْءٍۢ شَهِيدٌ
We shall show them Our portents on the horizons and within themselves until it will be manifest unto them that it is the Truth. Doth not thy Lord suffice, since He is Witness over all things?
Surah Fussilat(41:53)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter: The letter of the Prophet (saws) to Kisra (Khosrau) and Qaiser (Caesar)
Narrated Ibn `Abbas:
Allah's Messenger (ﷺ) sent a letter to Khosrau with `Abdullah bin Hudhafa As-Sahmi and told him to hand it over to the governor of Al-Bahrain. The governor of Al-Bahrain handed it over to Khosrau, and when he read the latter, he tore it into pieces. (The sub-narrator added, "I think that Ibn Al-Musaiyab said, 'Allah 's Apostle invoked (Allah) to tear them all totally Khosrau and his companions) into pieces.
Sahih al-Bukhari 4424