Well, the Hijri date 21 Rabi Al Awwal 1458 corresponds to the Gregorian date Saturday, 17 May 2036. This date lies in the third month of the Hijri year 1458 AH, which is Rabi Al-Awwal of 1458 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1458/03/21 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 17 May 2036 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Awwal 1458 AH to its equivalent Gregorian date.
زَعَمَ ٱلَّذِينَ كَفَرُوٓا۟ أَن لَّن يُبْعَثُوا۟ ۚ قُلْ بَلَىٰ وَرَبِّى لَتُبْعَثُنَّ ثُمَّ لَتُنَبَّؤُنَّ بِمَا عَمِلْتُمْ ۚ وَذَٰلِكَ عَلَى ٱللَّهِ يَسِيرٌۭ
Those who disbelieve assert that they will not be raised again. Say (unto them, O Muhammad): Yea, verily, by my Lord! ye will be raised again and then ye will be informed of what ye did; and that is easy for Allah.
Surah At-Taghaabun(64:7)