Well, the Hijri date 12 Rajab 1166 corresponds to the Gregorian date Monday, 14 May 1753. This date lies in the seventh month of the Hijri year 1166 AH, which is Rajab of 1166 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1166/07/12 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 14 May 1753 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Rajab 1166 AH to its equivalent Gregorian date.
وَمِنْ حَيْثُ خَرَجْتَ فَوَلِّ وَجْهَكَ شَطْرَ ٱلْمَسْجِدِ ٱلْحَرَامِ ۚ وَحَيْثُ مَا كُنتُمْ فَوَلُّوا۟ وُجُوهَكُمْ شَطْرَهُۥ لِئَلَّا يَكُونَ لِلنَّاسِ عَلَيْكُمْ حُجَّةٌ إِلَّا ٱلَّذِينَ ظَلَمُوا۟ مِنْهُمْ فَلَا تَخْشَوْهُمْ وَٱخْشَوْنِى وَلِأُتِمَّ نِعْمَتِى عَلَيْكُمْ وَلَعَلَّكُمْ تَهْتَدُونَ
Whencesoever thou comest forth turn thy face toward the Inviolable Place of Worship; and wheresoever ye may be (O Muslims) turn your faces toward it (when ye pray) so that men may have no argument against you, save such of them as do injustice - Fear them not, but fear Me! - and so that I may complete My grace upon you, and that ye may be guided.
Surah Al-Baqara(2:150)