Well, the Hijri date 15 Rabi Al Thani 1442 corresponds to the Gregorian date Monday, 30 November 2020. This date lies in the fourth month of the Hijri year 1442 AH, which is Rabi Al-Thani of 1442 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1442/04/15 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 30 November 2020 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Rabi Al Thani 1442 AH to its equivalent Gregorian date.
إِذْ قَالَ ٱللَّهُ يَٰعِيسَىٰٓ إِنِّى مُتَوَفِّيكَ وَرَافِعُكَ إِلَىَّ وَمُطَهِّرُكَ مِنَ ٱلَّذِينَ كَفَرُوا۟ وَجَاعِلُ ٱلَّذِينَ ٱتَّبَعُوكَ فَوْقَ ٱلَّذِينَ كَفَرُوٓا۟ إِلَىٰ يَوْمِ ٱلْقِيَٰمَةِ ۖ ثُمَّ إِلَىَّ مَرْجِعُكُمْ فَأَحْكُمُ بَيْنَكُمْ فِيمَا كُنتُمْ فِيهِ تَخْتَلِفُونَ
(And remember) when Allah said: O Jesus! Lo! I am gathering thee and causing thee to ascend unto Me, and am cleansing thee of those who disbelieve and am setting those who follow thee above those who disbelieve until the Day of Resurrection. Then unto Me ye will (all) return, and I shall judge between you as to that wherein ye used to differ.
Surah Aal-i-Imraan(3:55)
Sahih al-Bukhari
Fasting
Chapter: Observing Saum on the first day of 'Eid-ul-Adha.
Narrated Ziyad bin Jubair:
A man went to Ibn `Umar I. and said, "A man vowed to fast one day (the sub-narrator thinks that he said that the day was Monday), and that day happened to be `Id day." Ibn `Umar said, "Allah orders vows to be fulfilled and the Prophet (ﷺ) forbade the fasting on this day (i.e. Id).
Sahih al-Bukhari 1994