Well, the Hijri date 21 Ramadan 1439 corresponds to the Gregorian date Tuesday, 5 June 2018. This date lies in the ninth month of the Hijri year 1439 AH, which is Ramadan of 1439 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1439/09/21 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 5 June 2018 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Ramadan 1439 AH to its equivalent Gregorian date.
ذَٰلِكَ مِمَّآ أَوْحَىٰٓ إِلَيْكَ رَبُّكَ مِنَ ٱلْحِكْمَةِ ۗ وَلَا تَجْعَلْ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ فَتُلْقَىٰ فِى جَهَنَّمَ مَلُومًۭا مَّدْحُورًا
This is (part) of that wisdom wherewith thy Lord hath inspired thee (O Muhammad). And set not up with Allah any other god, lest thou be cast into hell, reproved, abandoned.
Surah Al-Israa(17:39)
Sahih al-Bukhari
Fasting
Chapter: Can somebody else observe Saum instead of the dead?
Narrated `Aisha:
Allah's Messenger (ﷺ) said, "Whoever died and he ought to have fasted (the missed days of Ramadan) then his guardians must fast on his behalf."
Sahih al-Bukhari 1952