Well, the Hijri date 13 Rajab 1415 corresponds to the Gregorian date Thursday, 15 December 1994. This date lies in the seventh month of the Hijri year 1415 AH, which is Rajab of 1415 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1415/07/13 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 15 December 1994 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Rajab 1415 AH to its equivalent Gregorian date.
وَيَقُولُونَ مَتَىٰ هَٰذَا ٱلْوَعْدُ إِن كُنتُمْ صَٰدِقِينَ
And they say: When will this promise be fulfilled, if ye are truthful?
Surah Yunus(10:48)