Well, the Hijri date 28 Rajab 1400 corresponds to the Gregorian date Wednesday, 11 June 1980. This date lies in the seventh month of the Hijri year 1400 AH, which is Rajab of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1400/07/28 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 11 June 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 28 Rajab 1400 AH to its equivalent Gregorian date.
قُلْ هُوَ ٱلْقَادِرُ عَلَىٰٓ أَن يَبْعَثَ عَلَيْكُمْ عَذَابًۭا مِّن فَوْقِكُمْ أَوْ مِن تَحْتِ أَرْجُلِكُمْ أَوْ يَلْبِسَكُمْ شِيَعًۭا وَيُذِيقَ بَعْضَكُم بَأْسَ بَعْضٍ ۗ ٱنظُرْ كَيْفَ نُصَرِّفُ ٱلْءَايَٰتِ لَعَلَّهُمْ يَفْقَهُونَ
Say: He is able to send punishment upon you from above you or from beneath your feet, or to bewilder you with dissension and make you taste the tyranny one of another. See how We display the revelations so that they may understand.
Surah Al-An'aam(6:65)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
"But man is ever more quarrelsome than anything." (V.18:54)
Narrated `Ali:
That one night Allah's Messenger (ﷺ) came to him and Fatima and said, "Don't you (both offer the (Tahajjud) prayer?" `Ali said, 'When Allah wishes us to get up, we get up." The Prophet (ﷺ) then recited: 'But man is more quarrelsome than anything.' (18.54) (See Hadith No. 227,Vol. 2)
Sahih al-Bukhari 4724