Well, the Hijri date 27 Rabi Al Thani 1394 corresponds to the Gregorian date Sunday, 19 May 1974. This date lies in the fourth month of the Hijri year 1394 AH, which is Rabi Al-Thani of 1394 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1394/04/27 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 May 1974 to its equivalent Arabic date.
The following is the conversion of the Arabic date 27 Rabi Al Thani 1394 AH to its equivalent Gregorian date.
وَإِذْ أَخَذْنَا مِيثَٰقَكُمْ وَرَفَعْنَا فَوْقَكُمُ ٱلطُّورَ خُذُوا۟ مَآ ءَاتَيْنَٰكُم بِقُوَّةٍۢ وَٱسْمَعُوا۟ ۖ قَالُوا۟ سَمِعْنَا وَعَصَيْنَا وَأُشْرِبُوا۟ فِى قُلُوبِهِمُ ٱلْعِجْلَ بِكُفْرِهِمْ ۚ قُلْ بِئْسَمَا يَأْمُرُكُم بِهِۦٓ إِيمَٰنُكُمْ إِن كُنتُم مُّؤْمِنِينَ
And when We made with you a covenant and caused the Mount to tower above you, (saying): Hold fast by that which We have given you, and hear (Our Word), they said: We hear and we rebel. And (worship of) the calf was made to sink into their hearts because of their rejection (of the covenant). Say (unto them): Evil is that which your belief enjoineth on you, if ye are believers.
Surah Al-Baqara(2:93)