Well, the Hijri date 21 Muharram 1387 corresponds to the Gregorian date Sunday, 30 April 1967. This date lies in the first month of the Hijri year 1387 AH, which is Muharram of 1387 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1387/01/21 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 30 April 1967 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Muharram 1387 AH to its equivalent Gregorian date.
وَمَا تَفَرَّقُوٓا۟ إِلَّا مِنۢ بَعْدِ مَا جَآءَهُمُ ٱلْعِلْمُ بَغْيًۢا بَيْنَهُمْ ۚ وَلَوْلَا كَلِمَةٌۭ سَبَقَتْ مِن رَّبِّكَ إِلَىٰٓ أَجَلٍۢ مُّسَمًّۭى لَّقُضِىَ بَيْنَهُمْ ۚ وَإِنَّ ٱلَّذِينَ أُورِثُوا۟ ٱلْكِتَٰبَ مِنۢ بَعْدِهِمْ لَفِى شَكٍّۢ مِّنْهُ مُرِيبٍۢ
And they were not divided until after the knowledge came unto them, through rivalry among themselves; and had it not been for a Word that had already gone forth from thy Lord for an appointed term, it surely had been judged between them. And those who were made to inherit the Scripture after them are verily in hopeless doubt concerning it.
Surah Ash-Shura(42:14)
Sahih al-Bukhari
Virtues of the Qur'an
Chapter: The best among you are those who learn the Qur'an and teach it
Narrated `Uthman bin `Affan:
The Prophet (ﷺ) said, "The most superior among you (Muslims) are those who learn the Qur'an and teach it."
Sahih al-Bukhari 5028