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.
وَإِذْ أَخَذَ ٱللَّهُ مِيثَٰقَ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَٰبَ لَتُبَيِّنُنَّهُۥ لِلنَّاسِ وَلَا تَكْتُمُونَهُۥ فَنَبَذُوهُ وَرَآءَ ظُهُورِهِمْ وَٱشْتَرَوْا۟ بِهِۦ ثَمَنًۭا قَلِيلًۭا ۖ فَبِئْسَ مَا يَشْتَرُونَ
And (remember) when Allah laid a charge on those who had received the Scripture (He said): Ye are to expound it to mankind and not to hide it. But they flung it behind their backs and bought thereby a little gain. Verily evil is that which they have gained thereby.
Surah Aal-i-Imraan(3:187)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah the Most High: "Verily, We have given you (O Muḥammad pbuh) a manifest victory." (V.48:1)
Narrated `Abdullah bin Mughaffal:
On the Day of the Conquest of Mecca, the Prophet (ﷺ) recited Surat Al-Fath in a vibrating and pleasant voice. (Muawaiya, the subnarrator said, "If I could imitate the recitation of the Prophet (ﷺ) I would do so.")
Sahih al-Bukhari 4835