Well, the Hijri date 18 Dhul Qidah 1439 corresponds to the Gregorian date Tuesday, 31 July 2018. This date lies in the eleventh month of the Hijri year 1439 AH, which is Dhu Al-Qidah of 1439 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1439/11/18 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 July 2018 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Dhul Qidah 1439 AH to its equivalent Gregorian date.
وَقَالُوا۟ لَن نُّؤْمِنَ لَكَ حَتَّىٰ تَفْجُرَ لَنَا مِنَ ٱلْأَرْضِ يَنۢبُوعًا
And they say: We will not put faith in thee till thou cause a spring to gush forth from the earth for us;
Surah Al-Israa(17:90)