Well, the Hijri date 21 Rabi Al Awwal 1203 corresponds to the Gregorian date Friday, 19 December 1788. This date lies in the third month of the Hijri year 1203 AH, which is Rabi Al-Awwal of 1203 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1203/03/21 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 19 December 1788 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Awwal 1203 AH to its equivalent Gregorian date.
يَوْمَ تَرَى ٱلْمُؤْمِنِينَ وَٱلْمُؤْمِنَٰتِ يَسْعَىٰ نُورُهُم بَيْنَ أَيْدِيهِمْ وَبِأَيْمَٰنِهِم بُشْرَىٰكُمُ ٱلْيَوْمَ جَنَّٰتٌۭ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَٰرُ خَٰلِدِينَ فِيهَا ۚ ذَٰلِكَ هُوَ ٱلْفَوْزُ ٱلْعَظِيمُ
On the day when thou (Muhammad) wilt see the believers, men and women, their light shining forth before them and on their right hands, (and wilt hear it said unto them): Glad news for you this day: Gardens underneath which rivers flow, wherein ye are immortal. That is the supreme triumph.
Surah Al-Hadid(57:12)