Well, the Hijri date 20 Ramadan 1408 corresponds to the Gregorian date Friday, 6 May 1988. This date lies in the ninth month of the Hijri year 1408 AH, which is Ramadan of 1408 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1408/09/20 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 6 May 1988 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Ramadan 1408 AH to its equivalent Gregorian date.
ذَٰلِكَ بِأَنَّهُمُ ٱتَّبَعُوا۟ مَآ أَسْخَطَ ٱللَّهَ وَكَرِهُوا۟ رِضْوَٰنَهُۥ فَأَحْبَطَ أَعْمَٰلَهُمْ
That will be because they followed that which angereth Allah, and hated that which pleaseth Him. Therefor He hath made their actions vain.
Surah Muhammad(47:28)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter: The Ghazwa of Dhat-ur-Riqa
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Jabir added, "We were with the Prophet (ﷺ) at Nakhl and he offered the Fear prayer." Abu Huraira said, "I offered the Fear prayer with the Prophet (ﷺ) during the Ghazwa (i.e. the battle) of Najd." Abu Huraira came to the Prophet (ﷺ) during the day of Khaibar.
Sahih al-Bukhari 4137