Well, the Hijri date 17 Rabi Al Thani 1400 corresponds to the Gregorian date Tuesday, 4 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 Tuesday without any doubt. The Arabic date 1400/04/17 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 4 March 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 17 Rabi Al Thani 1400 AH to its equivalent Gregorian date.
فَكَيْفَ كَانَ عَذَابِى وَنُذُرِ
Then see how (dreadful) was My punishment after My warnings!
Surah Al-Qamar(54:16)
Sahih al-Bukhari
Oaths and Vows
Chapter: How did the oaths of the Prophet (saws) use to be?
Narrated Abu Dhar:
I reached him (the Prophet (ﷺ) ) while in the shade of the Ka`ba; he was saying, "They are the losers, by the Lord of the Ka`ba! They are the losers, by the Lord of the Ka`ba!" I said (to myself ), "What is wrong with me? Is anything improper detected in me? What is wrong with me? Then I sat beside him and he kept on saying his statement. I could not remain quiet, and Allah knows in what sorrowful state I was at that time. So I said, ' Who are they (the losers)? Let My father and mother be sacrificed for you, O Allah's Messenger (ﷺ)!" He said, "They are the wealthy people, except the one who does like this and like this and like this (i.e., spends of his wealth in Allah's Cause).
Sahih al-Bukhari 6638
