Well, the Hijri date 17 Muharram 1380 corresponds to the Gregorian date Monday, 11 July 1960. This date lies in the first month of the Hijri year 1380 AH, which is Muharram of 1380 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1380/01/17 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 11 July 1960 to its equivalent Arabic date.
The following is the conversion of the Arabic date 17 Muharram 1380 AH to its equivalent Gregorian date.
وَيُسْقَوْنَ فِيهَا كَأْسًۭا كَانَ مِزَاجُهَا زَنجَبِيلًا
There are they watered with a cup whereof the mixture is of Zanjabil,
Surah Al-Insaan(76:17)
Sahih al-Bukhari
The Two Festivals (Eids)
Chapter: If the Imam is asked about something while he is delivering the Khutba
Narrated Al-Bara' bin `Azib:
On the day of Nahr Allah's Messenger (ﷺ) delivered the Khutba after the `Id prayer and said, "Anyone who prayed like us and slaughtered the sacrifice like we did then he acted according to our (Nusuk) tradition of sacrificing, and whoever slaughtered the sacrifice before the prayer, then that was just mutton (i.e. not sacrifice)." Abu Burda bin Naiyar stood up and said, "O Allah's Messenger (ﷺ)! By Allah, I slaughtered my sacrifice before I offered the (Id) prayer and thought that today was the day of eating and drinking (nonalcoholic drinks) and so I made haste (in slaughtering) and ate and also fed my family and neighbors." Allah's Messenger (ﷺ) said, "That was just mutton (not a sacrifice)." Then Abu Burda said, "I have a young she-goat and no doubt, it is better than two sheep. Will that be sufficient as a sacrifice for me?" The Prophet (ﷺ) replied, "Yes. But it will not be sufficient for anyone else (as a sacrifice), after you."
Sahih al-Bukhari 983