Well, the Hijri date 17 Rajab 1400 corresponds to the Gregorian date Saturday, 31 May 1980. This date lies in the seventh month of the Hijri year 1400 AH, which is Rajab of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1400/07/17 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 31 May 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 17 Rajab 1400 AH to its equivalent Gregorian date.
فَٱسْتَخَفَّ قَوْمَهُۥ فَأَطَاعُوهُ ۚ إِنَّهُمْ كَانُوا۟ قَوْمًۭا فَٰسِقِينَ
Surah Az-Zukhruf(43:54)
Sahih al-Bukhari
Divorce
Chapter: "Those who take an oath, not to have sexual relations with their wives, must wait four months."
Narrated Anas bin Malik:
Allah's Messenger (ﷺ) took an oath that he would abstain from his wives, and at that time his leg had been sprained (dislocated). So he stayed in the Mashruba (an attic room) of his for 29 days. Then he came down, and they (the people) said, "O Allah's Messenger (ﷺ)! You took an oath to abstain from your wives for one month." He said, "The month is of twenty nine days."
Sahih al-Bukhari 5289