Well, the Hijri date 20 Shaban 1375 corresponds to the Gregorian date Sunday, 1 April 1956. This date lies in the eighth month of the Hijri year 1375 AH, which is Shaban of 1375 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1375/08/20 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 1 April 1956 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Shaban 1375 AH to its equivalent Gregorian date.
يُنۢبِتُ لَكُم بِهِ ٱلزَّرْعَ وَٱلزَّيْتُونَ وَٱلنَّخِيلَ وَٱلْأَعْنَٰبَ وَمِن كُلِّ ٱلثَّمَرَٰتِ ۗ إِنَّ فِى ذَٰلِكَ لَءَايَةًۭ لِّقَوْمٍۢ يَتَفَكَّرُونَ
Therewith He causeth crops to grow for you, and the olive and the date-palm and grapes and all kinds of fruit. Lo! herein is indeed a portent for people who reflect.
Surah An-Nahl(16:11)
Sahih al-Bukhari
Invoking Allah for Rain (Istisqaa)
Chapter: Request of the people to the Imam to offer the Istisqa' prayer
Narrated `Abdullah bin Dinar:
My father said, "I heard Ibn `Umar reciting the poetic verses of Abu Talib: And a white (person) (i.e. the Prophet) who is requested to pray for rain and who takes care of the orphans and is the guardian of widows." Salim's father (Ibn `Umar) said, "The following poetic verse occurred to my mind while I was looking at the face of the Prophet (p.b.u.h) while he was praying for rain. He did not get down till the rain water flowed profusely from every roof-gutter: And a white (person) who is requested to pray for rain and who takes care of the orphans and is the guardian of widows . . . And these were the words of Abu Talib."
Sahih al-Bukhari 1008, 1009