Well, the Hijri date 14 Dhul Hijjah 1378 corresponds to the Gregorian date Saturday, 20 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 Saturday without any doubt. The Arabic date 1378/12/14 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 20 June 1959 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Dhul Hijjah 1378 AH to its equivalent Gregorian date.
وَتَرَى ٱلْجِبَالَ تَحْسَبُهَا جَامِدَةًۭ وَهِىَ تَمُرُّ مَرَّ ٱلسَّحَابِ ۚ صُنْعَ ٱللَّهِ ٱلَّذِىٓ أَتْقَنَ كُلَّ شَىْءٍ ۚ إِنَّهُۥ خَبِيرٌۢ بِمَا تَفْعَلُونَ
And thou seest the hills thou deemest solid flying with the flight of clouds: the doing of Allah Who perfecteth all things. Lo! He is Informed of what ye do.
Surah An-Naml(27:88)
Sahih al-Bukhari
Oaths and Vows
Chapter: To vow for something not possessed, and for something sinful
Narrated `Aisha:
The Prophet (ﷺ) said, "Whoever vowed to be obedient to Allah, must be obedient to Him; and whoever vowed to be disobedient to Allah, should not be disobedient to Him."
Sahih al-Bukhari 6700