Well, the Hijri date 12 Rajab 1366 corresponds to the Gregorian date Sunday, 1 June 1947. This date lies in the seventh month of the Hijri year 1366 AH, which is Rajab of 1366 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1366/07/12 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 1 June 1947 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Rajab 1366 AH to its equivalent Gregorian date.
وَلَقَدْ أَرْسَلْنَا رُسُلًۭا مِّن قَبْلِكَ مِنْهُم مَّن قَصَصْنَا عَلَيْكَ وَمِنْهُم مَّن لَّمْ نَقْصُصْ عَلَيْكَ ۗ وَمَا كَانَ لِرَسُولٍ أَن يَأْتِىَ بِـَٔايَةٍ إِلَّا بِإِذْنِ ٱللَّهِ ۚ فَإِذَا جَآءَ أَمْرُ ٱللَّهِ قُضِىَ بِٱلْحَقِّ وَخَسِرَ هُنَالِكَ ٱلْمُبْطِلُونَ
Verily We sent messengers before thee, among them those of whom We have told thee, and some of whom We have not told thee; and it was not given to any messenger that he should bring a portent save by Allah's leave, but when Allah's commandment cometh (the cause) is judged aright, and the followers of vanity will then be lost.
Surah Ghafir(40:78)
Sahih al-Bukhari
Good Manners and Form (Al-Adab)
Chapter: A man should not abuse his parents
Narrated `Abdullah bin `Amr:
Allah's Messenger (ﷺ) said. "It is one of the greatest sins that a man should curse his parents." It was asked (by the people), "O Allah's Messenger (ﷺ)! How does a man curse his parents?" The Prophet (ﷺ) said, "'The man abuses the father of another man and the latter abuses the father of the former and abuses his mother."
Sahih al-Bukhari 5973