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.
فَوَيْلٌۭ لِّلَّذِينَ يَكْتُبُونَ ٱلْكِتَٰبَ بِأَيْدِيهِمْ ثُمَّ يَقُولُونَ هَٰذَا مِنْ عِندِ ٱللَّهِ لِيَشْتَرُوا۟ بِهِۦ ثَمَنًۭا قَلِيلًۭا ۖ فَوَيْلٌۭ لَّهُم مِّمَّا كَتَبَتْ أَيْدِيهِمْ وَوَيْلٌۭ لَّهُم مِّمَّا يَكْسِبُونَ
Therefore woe be unto those who write the Scripture with their hands and then say, "This is from Allah," that they may purchase a small gain therewith. Woe unto them for that their hands have written, and woe unto them for that they earn thereby.
Surah Al-Baqara(2:79)