Well, the Hijri date 20 Shawwal 1378 corresponds to the Gregorian date Tuesday, 28 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 Tuesday without any doubt. The Arabic date 1378/10/20 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 28 April 1959 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Shawwal 1378 AH to its equivalent Gregorian date.
وَمَن كَانَ فِى هَٰذِهِۦٓ أَعْمَىٰ فَهُوَ فِى ٱلْءَاخِرَةِ أَعْمَىٰ وَأَضَلُّ سَبِيلًۭا
Whoso is blind here will be blind in the Hereafter, and yet further from the road.
Surah Al-Israa(17:72)
Sahih al-Bukhari
Fasting
Chapter: Fasting the last days of the month
Narrated Mutarrif from `Imran Ibn Husain:
That the Prophet (ﷺ) asked him (Imran) or asked a man and `Imran was listening, "O Abu so-and-so! Have you fasted the last days of this month?" (The narrator thought that he said, "the month of Ramadan"). The man replied, "No, O Allah's Messenger (ﷺ)!" The Prophet (ﷺ) said to him, "When you finish your fasting (of Ramadan) fast two days (in Shawwal)." Through another series of narrators `Imran said, "The Prophet (ﷺ) said, '(Have you fasted) the last days of Sha'ban?"
Sahih al-Bukhari 1983