Well, the Hijri date 12 Rajab 1400 corresponds to the Gregorian date Monday, 26 May 1980. This date lies in the seventh month of the Hijri year 1400 AH, which is Rajab of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1400/07/12 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 26 May 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Rajab 1400 AH to its equivalent Gregorian date.
قُل لِّلَّهِ ٱلشَّفَٰعَةُ جَمِيعًۭا ۖ لَّهُۥ مُلْكُ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ ۖ ثُمَّ إِلَيْهِ تُرْجَعُونَ
Say: Unto Allah belongeth all intercession. His is the Sovereignty of the heavens and the earth. And afterward unto Him ye will be brought back.
Surah Az-Zumar(39:44)
Sahih al-Bukhari
Merits of the Helpers in Madinah (Ansaar)
Chapter: How the Prophet (saws) established the bond of brotherhood between his
Narrated Anas:
When `Abdur-Rahman bin `Auf came to Medina and the Prophet (ﷺ) established the bond of brotherhood between him and Sa`d bin Ar-Rabi-al-Ansari, Saud suggested that `Abdur-Rahman should accept half of his property and family. `Abdur Rahman said, "May Allah bless you in your family and property; guide me to the market." So `Abdur-Rahman (while doing business in the market) made some profit of some condensed dry yoghurt and butter. After a few days the Prophet (ﷺ) saw him wearing clothes stained with yellow perfume. The Prophet (ﷺ) asked, "What is this, O `Abdur-Rahman?" He said, "O Allah's Messenger (ﷺ)! I have married an Ansar' woman." The Prophet (ﷺ) asked, "What have you given her as Mahr?" He (i.e. `Abdur-Rahman) said, "A piece of gold, about the weight of a date stone." Then the Prophet said, Give a banquet, even though of a sheep."
Sahih al-Bukhari 3937