Well, the Hijri date 14 Rajab 1400 corresponds to the Gregorian date Wednesday, 28 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 Wednesday without any doubt. The Arabic date 1400/07/14 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 28 May 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Rajab 1400 AH to its equivalent Gregorian date.
وَلَمَّا بَرَزُوا۟ لِجَالُوتَ وَجُنُودِهِۦ قَالُوا۟ رَبَّنَآ أَفْرِغْ عَلَيْنَا صَبْرًۭا وَثَبِّتْ أَقْدَامَنَا وَٱنصُرْنَا عَلَى ٱلْقَوْمِ ٱلْكَٰفِرِينَ
And when they went into the field against Goliath and his hosts they said: Our Lord! Bestow on us endurance, make our foothold sure, and give us help against the disbelieving folk.
Surah Al-Baqara(2:250)
Sahih al-Bukhari
Fasting
Chapter: Observing Saum (fast) on Tashriq days.
Narrated `Aisha and Ibn `Umar:
Nobody was allowed to fast on the days of Tashriq except those who could not afford the Hadi (Sacrifice).
Sahih al-Bukhari 1997, 1998