Well, the Hijri date 12 Rajab 1403 corresponds to the Gregorian date Monday, 25 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 Monday without any doubt. The Arabic date 1403/07/12 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 25 April 1983 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Rajab 1403 AH to its equivalent Gregorian date.
هَلْ أُنَبِّئُكُمْ عَلَىٰ مَن تَنَزَّلُ ٱلشَّيَٰطِينُ
Shall I inform you upon whom the devils descend?
Surah Ash-Shu'araa(26:221)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
"... Join not in worship others with Allah. Verily! Joining others in worship with Allah is a great Ẓulm (wrong) indeed." (V.31:13)
Narrated `Abdullah:
When there was revealed: 'It is those who believe and confuse not their beliefs with wrong.' (6.82) It was very hard for the companions of Allah's Messenger (ﷺ), so they said, "Which of us has not confused his belief with wrong?" Allah's Messenger (ﷺ) said, "The Verse does not mean this. Don't you hear Luqman's statement to his son: 'Verily! Joining others in worship, with Allah is a great wrong indeed.' (31.13)
Sahih al-Bukhari 4776