Well, the Hijri date 21 Muharram 1439 corresponds to the Gregorian date Wednesday, 11 October 2017. This date lies in the first month of the Hijri year 1439 AH, which is Muharram of 1439 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1439/01/21 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 11 October 2017 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Muharram 1439 AH to its equivalent Gregorian date.
وَإِذْ يَعِدُكُمُ ٱللَّهُ إِحْدَى ٱلطَّآئِفَتَيْنِ أَنَّهَا لَكُمْ وَتَوَدُّونَ أَنَّ غَيْرَ ذَاتِ ٱلشَّوْكَةِ تَكُونُ لَكُمْ وَيُرِيدُ ٱللَّهُ أَن يُحِقَّ ٱلْحَقَّ بِكَلِمَٰتِهِۦ وَيَقْطَعَ دَابِرَ ٱلْكَٰفِرِينَ
And when Allah promised you one of the two bands (of the enemy) that it should be yours, and ye longed that other than the armed one might be yours. And Allah willed that He should cause the Truth to triumph by His words, and cut the root of the disbelievers;
Surah Al-Anfaal(8:7)