Well, the Hijri date 21 Rabi Al Thani 1389 corresponds to the Gregorian date Saturday, 5 July 1969. This date lies in the fourth month of the Hijri year 1389 AH, which is Rabi Al-Thani of 1389 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1389/04/21 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 5 July 1969 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1389 AH to its equivalent Gregorian date.
وَكَذَٰلِكَ نُفَصِّلُ ٱلْءَايَٰتِ وَلِتَسْتَبِينَ سَبِيلُ ٱلْمُجْرِمِينَ
Thus do We expound the revelations that the way of the unrighteous may be manifest.
Surah Al-An'aam(6:55)