Well, the Hijri date 13 Rajab 1436 corresponds to the Gregorian date Saturday, 2 May 2015. This date lies in the seventh month of the Hijri year 1436 AH, which is Rajab of 1436 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1436/07/13 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 2 May 2015 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Rajab 1436 AH to its equivalent Gregorian date.
إِنَّ ٱلَّذِينَ ءَامَنُوا۟ وَٱلَّذِينَ هَادُوا۟ وَٱلصَّٰبِـِٔينَ وَٱلنَّصَٰرَىٰ وَٱلْمَجُوسَ وَٱلَّذِينَ أَشْرَكُوٓا۟ إِنَّ ٱللَّهَ يَفْصِلُ بَيْنَهُمْ يَوْمَ ٱلْقِيَٰمَةِ ۚ إِنَّ ٱللَّهَ عَلَىٰ كُلِّ شَىْءٍۢ شَهِيدٌ
Lo! those who believe (this revelation), and those who are Jews, and the Sabaeans and the Christians and the Magians and the idolaters - Lo! Allah will decide between them on the Day of Resurrection. Lo! Allah is Witness over all things.
Surah Al-Hajj(22:17)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah: "They are those whom Allah had guided. So, follow their guidance..." (V.6:90)
Narrated Mujahid:
That he asked Ibn `Abbas, "Is there a prostration Surat-al-Sa`d?" (38.24) Ibn `Abbas said, "Yes," and then recited: "We gave...So follow their guidance." (6.85,90) Then he said, "He (David ) is one them (i.e. those prophets)." Mujahid narrated: I asked Ibn `Abbas (regarding the above Verse). He said, "Your Prophet (Muhammad) was one of those who were ordered to follow them."
Sahih al-Bukhari 4632