Well, the Hijri date 15 Shawwal 1403 corresponds to the Gregorian date Monday, 25 July 1983. This date lies in the tenth month of the Hijri year 1403 AH, which is Shawwal of 1403 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1403/10/15 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 25 July 1983 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Shawwal 1403 AH to its equivalent Gregorian date.
ٱلَّذِى خَلَقَ سَبْعَ سَمَٰوَٰتٍۢ طِبَاقًۭا ۖ مَّا تَرَىٰ فِى خَلْقِ ٱلرَّحْمَٰنِ مِن تَفَٰوُتٍۢ ۖ فَٱرْجِعِ ٱلْبَصَرَ هَلْ تَرَىٰ مِن فُطُورٍۢ
Who hath created seven heavens in harmony. Thou (Muhammad) canst see no fault in the Beneficent One's creation; then look again: Canst thou see any rifts?
Surah Al-Mulk(67:3)