Well, the Hijri date 14 Rajab 1287 corresponds to the Gregorian date Sunday, 9 October 1870. This date lies in the seventh month of the Hijri year 1287 AH, which is Rajab of 1287 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1287/07/14 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 9 October 1870 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Rajab 1287 AH to its equivalent Gregorian date.
قَيِّمًۭا لِّيُنذِرَ بَأْسًۭا شَدِيدًۭا مِّن لَّدُنْهُ وَيُبَشِّرَ ٱلْمُؤْمِنِينَ ٱلَّذِينَ يَعْمَلُونَ ٱلصَّٰلِحَٰتِ أَنَّ لَهُمْ أَجْرًا حَسَنًۭا
(But hath made it) straight, to give warning of stern punishment from Him, and to bring unto the believers who do good works the news that theirs will be a fair reward,
Surah Al-Kahf(18:2)