Well, the Hijri date 15 Rajab 1275 corresponds to the Gregorian date Thursday, 17 February 1859. This date lies in the seventh month of the Hijri year 1275 AH, which is Rajab of 1275 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1275/07/15 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 17 February 1859 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Rajab 1275 AH to its equivalent Gregorian date.
فَإِن لَّمْ تَفْعَلُوا۟ وَلَن تَفْعَلُوا۟ فَٱتَّقُوا۟ ٱلنَّارَ ٱلَّتِى وَقُودُهَا ٱلنَّاسُ وَٱلْحِجَارَةُ ۖ أُعِدَّتْ لِلْكَٰفِرِينَ
And if ye do it not - and ye can never do it - then guard yourselves against the Fire prepared for disbelievers, whose fuel is of men and stones.
Surah Al-Baqara(2:24)