Well, the Hijri date 21 Rabi Al Thani 1400 corresponds to the Gregorian date Saturday, 8 March 1980. This date lies in the fourth month of the Hijri year 1400 AH, which is Rabi Al-Thani of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1400/04/21 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 8 March 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1400 AH to its equivalent Gregorian date.
هَلْ أَتَىٰكَ حَدِيثُ مُوسَىٰٓ
Surah An-Naazi'aat(79:15)
Sahih al-Bukhari
Call to Prayers (Adhaan)
Chapter: The limit set for a patient to attend the congregational Salat (prayer)?
Narrated `Aisha:
"When the Prophet (ﷺ) became seriously ill and his disease became aggravated he asked for permission from his wives to be nursed in my house and he was allowed. He came out with the help of two men and his legs were dragging on the ground. He was between Al-`Abbas and another man." 'Ubaidullah said, "I told Ibn `Abbas what `Aisha had narrated and he said, 'Do you know who was the (second) man whose name `Aisha did not mention'" I said, 'No.' Ibn `Abbas said, 'He was `Ali Ibn Abi Talib.' "
Sahih al-Bukhari 665