Well, the Hijri date 21 Shaban 1408 corresponds to the Gregorian date Friday, 8 April 1988. This date lies in the eighth month of the Hijri year 1408 AH, which is Shaban of 1408 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1408/08/21 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 8 April 1988 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Shaban 1408 AH to its equivalent Gregorian date.
لَقَدْ نَصَرَكُمُ ٱللَّهُ فِى مَوَاطِنَ كَثِيرَةٍۢ ۙ وَيَوْمَ حُنَيْنٍ ۙ إِذْ أَعْجَبَتْكُمْ كَثْرَتُكُمْ فَلَمْ تُغْنِ عَنكُمْ شَيْـًۭٔا وَضَاقَتْ عَلَيْكُمُ ٱلْأَرْضُ بِمَا رَحُبَتْ ثُمَّ وَلَّيْتُم مُّدْبِرِينَ
Allah hath given you victory on many fields and on the day of Huneyn, when ye exulted in your multitude but it availed you naught, and the earth, vast as it is, was straitened for you; then ye turned back in flight;
Surah At-Tawba(9:25)