Well, the Hijri date 26 Jumada Al Oula 1498 corresponds to the Gregorian date Saturday, 11 May 2075. This date lies in the fifth month of the Hijri year 1498 AH, which is Jumada Al-Awwal of 1498 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1498/05/26 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.
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The following is the conversion of the Gregorian date 11 May 2075 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Jumada Al Oula 1498 AH to its equivalent Gregorian date.
وَجَعَلْنَا ٱلسَّمَآءَ سَقْفًۭا مَّحْفُوظًۭا ۖ وَهُمْ عَنْ ءَايَٰتِهَا مُعْرِضُونَ
And we have made the sky a roof withheld (from them). Yet they turn away from its portents.
Surah Al-Anbiyaa(21:32)
Sahih al-Bukhari
Oaths and Vows
Chapter: If someone does something against his oath due to forgetfulness
Narrated Ibn Mas`ud:
that Allah's Prophet led them in the Zuhr prayer and he offered either more or less rak`at, and it was said to him, "O Allah's Messenger (ﷺ) ! Has the prayer been reduced, or have you forgotten?" He asked, "What is that?" They said, "You have prayed so many rak`at." So he performed with them two more prostrations and said, "These two prostrations are to be performed by the person who does not know whether he has prayed more or less (rak`at) in which case he should seek to follow what is right. And then complete the rest (of the prayer) and perform two extra prostrations."
Sahih al-Bukhari 6671