Well, the Hijri date 28 Ramadan 1397 corresponds to the Gregorian date Sunday, 11 September 1977. This date lies in the ninth month of the Hijri year 1397 AH, which is Ramadan of 1397 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1397/09/28 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 September 1977 to its equivalent Arabic date.
The following is the conversion of the Arabic date 28 Ramadan 1397 AH to its equivalent Gregorian date.
مَّن يُصْرَفْ عَنْهُ يَوْمَئِذٍۢ فَقَدْ رَحِمَهُۥ ۚ وَذَٰلِكَ ٱلْفَوْزُ ٱلْمُبِينُ
He from whom (such retribution) is averted on that day, (Allah) hath in truth had mercy on him. That will be the signal triumph.
Surah Al-An'aam(6:16)