Well, the Hijri date 12 Dhul Qidah 1400 corresponds to the Gregorian date Sunday, 21 September 1980. This date lies in the eleventh month of the Hijri year 1400 AH, which is Dhu Al-Qidah of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1400/11/12 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 21 September 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Dhul Qidah 1400 AH to its equivalent Gregorian date.
وَٱلَّذِينَ هَاجَرُوا۟ فِى ٱللَّهِ مِنۢ بَعْدِ مَا ظُلِمُوا۟ لَنُبَوِّئَنَّهُمْ فِى ٱلدُّنْيَا حَسَنَةًۭ ۖ وَلَأَجْرُ ٱلْءَاخِرَةِ أَكْبَرُ ۚ لَوْ كَانُوا۟ يَعْلَمُونَ
And those who became fugitives for the cause of Allah after they had been oppressed, We verily shall give them goodly lodging in the world, and surely the reward of the Hereafter is greater, if they but knew;
Surah An-Nahl(16:41)