Well, the Hijri date 4 Rajab 1403 corresponds to the Gregorian date Sunday, 17 April 1983. This date lies in the seventh month of the Hijri year 1403 AH, which is Rajab of 1403 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1403/07/04 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 April 1983 to its equivalent Arabic date.
The following is the conversion of the Arabic date 4 Rajab 1403 AH to its equivalent Gregorian date.
قُلْ إِنَّ ٱلْمَوْتَ ٱلَّذِى تَفِرُّونَ مِنْهُ فَإِنَّهُۥ مُلَٰقِيكُمْ ۖ ثُمَّ تُرَدُّونَ إِلَىٰ عَٰلِمِ ٱلْغَيْبِ وَٱلشَّهَٰدَةِ فَيُنَبِّئُكُم بِمَا كُنتُمْ تَعْمَلُونَ
Say (unto them, O Muhammad): Lo! the death from which ye shrink will surely meet you, and afterward ye will be returned unto the Knower of the Invisible and the Visible, and He will tell you what ye used to do.
Surah Al-Jumu'a(62:8)
Sahih al-Bukhari
Prayer at Night (Tahajjud)
Chapter: The superiority of Tahajjud prayer
Narrated Salim's father:
In the lifetime of the Prophet (ﷺ) whosoever saw a dream would narrate it to Allah's Messenger (ﷺ). I had a wish of seeing a dream to narrate it to Allah's Messenger (ﷺ) (p.b.u.h) I was a grown up boy and used to sleep in the Mosque in the lifetime of the Prophet. I saw in the dream that two angels caught hold of me and took me to the Fire which was built all round like a built well and had two poles in it and the people in it were known to me. I started saying, "I seek refuge with Allah from the Fire." Then I met another angel who told me not to be afraid. I narrated the dream to Hafsa who told it to Allah's Messenger (ﷺ). The Prophet said, "Abdullah is a good man. I wish he prayed Tahajjud." After that `Abdullah (i.e. Salim's father) used to sleep but a little at night.
Sahih al-Bukhari 1121, 1122