Well, the Hijri date 17 Ramadan 1398 corresponds to the Gregorian date Monday, 21 August 1978. This date lies in the ninth month of the Hijri year 1398 AH, which is Ramadan of 1398 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1398/09/17 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 21 August 1978 to its equivalent Arabic date.
The following is the conversion of the Arabic date 17 Ramadan 1398 AH to its equivalent Gregorian date.
ثُمَّ كَانَ عَٰقِبَةَ ٱلَّذِينَ أَسَٰٓـُٔوا۟ ٱلسُّوٓأَىٰٓ أَن كَذَّبُوا۟ بِـَٔايَٰتِ ٱللَّهِ وَكَانُوا۟ بِهَا يَسْتَهْزِءُونَ
Then evil was the consequence to those who dealt in evil, because they denied the revelations of Allah and made a mock of them.
Surah Ar-Room(30:10)
Sahih al-Bukhari
Hajj (Pilgrimage)
Chapter: Tawaf of Al-Qarin
Narrated Nafi`:
Ibn `Umar intended to perform Hajj in the year when Al-Hajjaj attacked Ibn Az-Zubair. Somebody said to Ibn `Umar, "There is a danger of an impending war between them." Ibn `Umar said, "Verily, in Allah's Messenger (ﷺ) you have a good example. (And if it happened as you say) then I would do the same as Allah's Messenger (ﷺ) had done. I make you witness that I have decided to perform `Umra." Then he set out and when he reached Al-Baida', he said, "The ceremonies of both Hajj and `Umra are similar. I make you witness that I have made Hajj compulsory for me along with `Umra." He drove (to Mecca) a Hadi which he had bought from (a place called) Qudaid and did not do more than that. He did not slaughter the Hadi or finish his Ihram, or shave or cut short his hair till the day of slaughtering the sacrifices (10th Dhul-Hijja). Then he slaughtered his Hadi and shaved his head and considered the first Tawaf (of Safa and Marwa) as sufficient for Hajj and `Umra. Ibn `Umar said, "Allah's Messenger (ﷺ) did the same."
Sahih al-Bukhari 1640