Well, the Hijri date 21 Muharram 1399 corresponds to the Gregorian date Thursday, 21 December 1978. This date lies in the first month of the Hijri year 1399 AH, which is Muharram of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1399/01/21 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 21 December 1978 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Muharram 1399 AH to its equivalent Gregorian date.
إِنَّ هَٰذَا ٱلْقُرْءَانَ يَهْدِى لِلَّتِى هِىَ أَقْوَمُ وَيُبَشِّرُ ٱلْمُؤْمِنِينَ ٱلَّذِينَ يَعْمَلُونَ ٱلصَّٰلِحَٰتِ أَنَّ لَهُمْ أَجْرًۭا كَبِيرًۭا
Lo! this Qur'an guideth unto that which is straightest, and giveth tidings unto the believers who do good works that theirs will be a great reward.
Surah Al-Israa(17:9)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah ta'ala: "And [He has sent him (Prophet Muḥammad pbuh) also to] others among them (Muslims) who have not yet joined them..." (V.62:3)
Narrated Abu Huraira:
The Prophet (ﷺ) said. Then some men from these people would attain it."
Sahih al-Bukhari 4898
