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.
وَلِسُلَيْمَٰنَ ٱلرِّيحَ غُدُوُّهَا شَهْرٌۭ وَرَوَاحُهَا شَهْرٌۭ ۖ وَأَسَلْنَا لَهُۥ عَيْنَ ٱلْقِطْرِ ۖ وَمِنَ ٱلْجِنِّ مَن يَعْمَلُ بَيْنَ يَدَيْهِ بِإِذْنِ رَبِّهِۦ ۖ وَمَن يَزِغْ مِنْهُمْ عَنْ أَمْرِنَا نُذِقْهُ مِنْ عَذَابِ ٱلسَّعِيرِ
And unto Solomon (We gave) the wind, whereof the morning course was a month's journey and the evening course a month's journey, and We caused the fount of copper to gush forth for him, and (We gave him) certain of the jinn who worked before him by permission of his Lord. And such of them as deviated from Our command, them We caused to taste the punishment of flaming Fire.
Surah Saba(34:12)
Sahih al-Bukhari
Fasting
Chapter: "Start observing Saum on seeing the crescent of Ramadan, and stop on seeing the crescent (of Shawwal)."
Narrated Anas:
Allah's Messenger (ﷺ) vowed to keep aloof from his wives for one month, and he had dislocation of his leg. So, he stayed in a Mashruba for 29 nights and then came down. Some people said, "O Allah's Messenger (ﷺ)! You vowed to stay aloof for one month," He replied, "The month is of 29 days."
Sahih al-Bukhari 1911