Well, the Hijri date 20 Jumada Al Oula 1390 corresponds to the Gregorian date Thursday, 23 July 1970. This date lies in the fifth month of the Hijri year 1390 AH, which is Jumada Al-Awwal of 1390 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1390/05/20 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 23 July 1970 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Jumada Al Oula 1390 AH to its equivalent Gregorian date.
فَكُبْكِبُوا۟ فِيهَا هُمْ وَٱلْغَاوُۥنَ
Then will they be hurled therein, they and the seducers
Surah Ash-Shu'araa(26:94)
Sahih al-Bukhari
Holding Fast to the Qur'an and Sunnah
Chapter: Something forbidden by the Prophet (saws) is legally prohibited
Narrated `Abdullah Al Muzam:
The Prophet (ﷺ) said, "Perform (an optional) prayer before Maghrib prayer." (He repeated it thrice) and the third time he said, "Whoever wants to offer it can do so," lest the people should take it as a Sunna (tradition). (See Hadith No. 277, Vol. 2)
Sahih al-Bukhari 7368