Well, the Hijri date 27 Ramadan 1407 corresponds to the Gregorian date Monday, 25 May 1987. This date lies in the ninth month of the Hijri year 1407 AH, which is Ramadan of 1407 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1407/09/27 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 25 May 1987 to its equivalent Arabic date.
The following is the conversion of the Arabic date 27 Ramadan 1407 AH to its equivalent Gregorian date.
فَٱعْبُدُوا۟ مَا شِئْتُم مِّن دُونِهِۦ ۗ قُلْ إِنَّ ٱلْخَٰسِرِينَ ٱلَّذِينَ خَسِرُوٓا۟ أَنفُسَهُمْ وَأَهْلِيهِمْ يَوْمَ ٱلْقِيَٰمَةِ ۗ أَلَا ذَٰلِكَ هُوَ ٱلْخُسْرَانُ ٱلْمُبِينُ
Then worship what ye will beside Him. Say: The losers will be those who lose themselves and their housefolk on the Day of Resurrection. Ah, that will be the manifest loss!
Surah Az-Zumar(39:15)