Well, the Hijri date 14 Rajab 1188 corresponds to the Gregorian date Monday, 19 September 1774. This date lies in the seventh month of the Hijri year 1188 AH, which is Rajab of 1188 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1188/07/14 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 19 September 1774 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Rajab 1188 AH to its equivalent Gregorian date.
بَلْ كَذَّبُوا۟ بِمَا لَمْ يُحِيطُوا۟ بِعِلْمِهِۦ وَلَمَّا يَأْتِهِمْ تَأْوِيلُهُۥ ۚ كَذَٰلِكَ كَذَّبَ ٱلَّذِينَ مِن قَبْلِهِمْ ۖ فَٱنظُرْ كَيْفَ كَانَ عَٰقِبَةُ ٱلظَّٰلِمِينَ
Nay, but they denied that, the knowledge whereof they could not compass, and whereof the interpretation (in events) hath not yet come unto them. Even so did those before them deny. Then see what was the consequence for the wrong-doers!
Surah Yunus(10:39)