Well, the Hijri date 21 Jumada Al Akhira 1399 corresponds to the Gregorian date Thursday, 17 May 1979. This date lies in the sixth month of the Hijri year 1399 AH, which is Jumada Al-Thani of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1399/06/21 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 17 May 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Jumada Al Akhira 1399 AH to its equivalent Gregorian date.
يُرْسِلِ ٱلسَّمَآءَ عَلَيْكُم مِّدْرَارًۭا
He will let loose the sky for you in plenteous rain,
Surah Nooh(71:11)
Sahih al-Bukhari
Penalty of Hunting while on Pilgrimage
Chapter: Fighting is prohibited in Makkah
Narrated Ibn `Abbas:
On the day of the conquest of Mecca, the Prophet (ﷺ) said, "There is no more emigration (from Mecca) but Jihad and intentions, and whenever you are called for Jihad, you should go immediately. No doubt, Allah has made this place (Mecca) a sanctuary since the creation of the heavens and the earth and will remain a sanctuary till the Day of Resurrection as Allah has ordained its sanctity. Fighting was not permissible in it for anyone before me, and even for me it was allowed only for a portion of a day. So, it is a sanctuary with Allah's sanctity till the Day of Resurrection. Its thorns should not be uprooted and its game should not be chased; and its luqata (fallen things) should not be picked up except by one who would announce that publicly, and its vegetation (grass etc.) should not be cut." Al-`Abbas said, "O Allah's Messenger (ﷺ)! Except Al-Idhkhir, (for it is used by their blacksmiths and for their domestic purposes)." So, the Prophet (ﷺ) said, "Except Al-Idhkhir."
Sahih al-Bukhari 1834