Well, the Hijri date 28 Rabi Al Awwal 1187 corresponds to the Gregorian date Friday, 18 June 1773. This date lies in the third month of the Hijri year 1187 AH, which is Rabi Al-Awwal of 1187 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1187/03/28 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 18 June 1773 to its equivalent Arabic date.
The following is the conversion of the Arabic date 28 Rabi Al Awwal 1187 AH to its equivalent Gregorian date.
فَجَآءَتْهُ إِحْدَىٰهُمَا تَمْشِى عَلَى ٱسْتِحْيَآءٍۢ قَالَتْ إِنَّ أَبِى يَدْعُوكَ لِيَجْزِيَكَ أَجْرَ مَا سَقَيْتَ لَنَا ۚ فَلَمَّا جَآءَهُۥ وَقَصَّ عَلَيْهِ ٱلْقَصَصَ قَالَ لَا تَخَفْ ۖ نَجَوْتَ مِنَ ٱلْقَوْمِ ٱلظَّٰلِمِينَ
Then there came unto him one of the two women, walking shyly. She said: Lo! my father biddeth thee, that he may reward thee with a payment for that thou didst water (the flock) for us. Then, when he came unto him and told him the (whole) story, he said: Fear not! Thou hast escaped from the wrongdoing folk.
Surah Al-Qasas(28:25)