Well, the Hijri date 21 Shawwal 1387 corresponds to the Gregorian date Sunday, 21 January 1968. This date lies in the tenth month of the Hijri year 1387 AH, which is Shawwal of 1387 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1387/10/21 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 January 1968 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Shawwal 1387 AH to its equivalent Gregorian date.
وَأُحِيطَ بِثَمَرِهِۦ فَأَصْبَحَ يُقَلِّبُ كَفَّيْهِ عَلَىٰ مَآ أَنفَقَ فِيهَا وَهِىَ خَاوِيَةٌ عَلَىٰ عُرُوشِهَا وَيَقُولُ يَٰلَيْتَنِى لَمْ أُشْرِكْ بِرَبِّىٓ أَحَدًۭا
And his fruit was beset (with destruction). Then began he to wring his hands for all that he had spent upon it, when (now) it was all ruined on its trellises, and to say: Would that I had ascribed no partner to my Lord!
Surah Al-Kahf(18:42)