Well, the Hijri date 12 Muharram 1399 corresponds to the Gregorian date Tuesday, 12 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 Tuesday without any doubt. The Arabic date 1399/01/12 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 12 December 1978 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Muharram 1399 AH to its equivalent Gregorian date.
قُل لَّآ أَجِدُ فِى مَآ أُوحِىَ إِلَىَّ مُحَرَّمًا عَلَىٰ طَاعِمٍۢ يَطْعَمُهُۥٓ إِلَّآ أَن يَكُونَ مَيْتَةً أَوْ دَمًۭا مَّسْفُوحًا أَوْ لَحْمَ خِنزِيرٍۢ فَإِنَّهُۥ رِجْسٌ أَوْ فِسْقًا أُهِلَّ لِغَيْرِ ٱللَّهِ بِهِۦ ۚ فَمَنِ ٱضْطُرَّ غَيْرَ بَاغٍۢ وَلَا عَادٍۢ فَإِنَّ رَبَّكَ غَفُورٌۭ رَّحِيمٌۭ
Say: I find not in that which is revealed unto me aught prohibited to an eater that he eat thereof, except it be carrion, or blood poured forth, or swineflesh - for that verily is foul - or the abomination which was immolated to the name of other than Allah. But whoso is compelled (thereto), neither craving nor transgressing, (for him) lo! thy Lord is Forgiving, Merciful.
Surah Al-An'aam(6:145)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
"We will make smooth for him the path for evil." (V.92:10)
Narrated `Ali:
While the Prophet (ﷺ) was in a funeral procession. he picked up something and started scraping the ground with it, and said, "There is none among you but has his place written for him either in the Hell Fire or in Paradise." They said, "O Allah's Messenger (ﷺ)! Shall we not depend upon what has been written for us and give up deeds? He said, "Carry on doing (good) deeds, for everybody will find easy to do such deeds as will lead him to his destined place for which he has been created. So he who is destined to be among the happy (in the Hereafter), will find it easy to do the deeds characteristic of such people, while he who is destined to be among the miserable ones, will find it easy to do the deeds characteristic of such people." Then he recited: 'As for him who gives (in charity) and fears Allah, and believes in the best....' (92.5-10)
Sahih al-Bukhari 4949