Well, the Hijri date 27 Muharram 1400 corresponds to the Gregorian date Sunday, 16 December 1979. This date lies in the first month of the Hijri year 1400 AH, which is Muharram of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1400/01/27 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 16 December 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 27 Muharram 1400 AH to its equivalent Gregorian date.
وَلَقَدْ كُذِّبَتْ رُسُلٌۭ مِّن قَبْلِكَ فَصَبَرُوا۟ عَلَىٰ مَا كُذِّبُوا۟ وَأُوذُوا۟ حَتَّىٰٓ أَتَىٰهُمْ نَصْرُنَا ۚ وَلَا مُبَدِّلَ لِكَلِمَٰتِ ٱللَّهِ ۚ وَلَقَدْ جَآءَكَ مِن نَّبَإِى۟ ٱلْمُرْسَلِينَ
Messengers indeed have been denied before thee, and they were patient under the denial and the persecution till Our succour reached them. There is none to alter the decisions of Allah. Already there hath reached thee (somewhat) of the tidings of the messengers (We sent before).
Surah Al-An'aam(6:34)
Sahih al-Bukhari
Shortening the Prayers (At-Taqseer)
Chapter: Whoever offered Nawafil not after the compulsory Salat but before it
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Narrated `Abdullah bin Amir that his father had told him that he had seen the Prophet (p.b.u.h) praying Nawafil at night on the back of his Mount on a journey, facing whatever direction it took.
Sahih al-Bukhari 1104