Well, the Hijri date 28 Jumada Al Oula 1421 corresponds to the Gregorian date Monday, 28 August 2000. This date lies in the fifth month of the Hijri year 1421 AH, which is Jumada Al-Awwal of 1421 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1421/05/28 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.
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The following is the conversion of the Gregorian date 28 August 2000 to its equivalent Arabic date.
The following is the conversion of the Arabic date 28 Jumada Al Oula 1421 AH to its equivalent Gregorian date.
وَإِنَّ رَبَّكَ هُوَ يَحْشُرُهُمْ ۚ إِنَّهُۥ حَكِيمٌ عَلِيمٌۭ
Lo! thy Lord will gather them together. Lo! He is Wise, Aware.
Surah Al-Hijr(15:25)
Sahih al-Bukhari
Good Manners and Form (Al-Adab)
Chapter: Whoever dipped a stick in water and mud
Narrated Abu Musa:
That he was in the company of the Prophet (ﷺ) in one of the gardens of Medina and in the hand of the Prophet there was a stick, and he was striking (slowly) the water and the mud with it. A man came (at the gate of the garden) and asked permission to enter. The Prophet (ﷺ) said, "Open the gate for him and give him the glad tidings of entering Paradise. "I went, and behold! It was Abu Bakr. So I opened the gate for him and informed him of the glad tidings of entering Paradise. Then another man came and asked permission to enter. The Prophet (ﷺ) said, "Open the gate for him and give him the glad tidings of entering Paradise." Behold! It was `Umar. So I opened the gate for him and gave him the glad tidings of entering Paradise. Then another man came and asked permission to enter. The Prophet (ﷺ) was sitting in a leaning posture, so he sat up and said, "Open the gate for him and give him the glad tidings of entering Paradise with a calamity which will befall him or which will take place." I went, and behold ! It was `Uthman. So I opened the gate for him and gave him the glad tidings of entering Paradise and also informed him of what the Prophet (ﷺ) had said (about a calamity). `Uthman said, "Allah Alone Whose Help I seek (against that calamity).
Sahih al-Bukhari 6216