Well, the Hijri date 1 Jumada Al Akhira 1420 corresponds to the Gregorian date Saturday, 11 September 1999. This date lies in the sixth month of the Hijri year 1420 AH, which is Jumada Al-Thani of 1420 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1420/06/01 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 September 1999 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Jumada Al Akhira 1420 AH to its equivalent Gregorian date.
قُلْ إِن تُخْفُوا۟ مَا فِى صُدُورِكُمْ أَوْ تُبْدُوهُ يَعْلَمْهُ ٱللَّهُ ۗ وَيَعْلَمُ مَا فِى ٱلسَّمَٰوَٰتِ وَمَا فِى ٱلْأَرْضِ ۗ وَٱللَّهُ عَلَىٰ كُلِّ شَىْءٍۢ قَدِيرٌۭ
Say, (O Muhammad): Whether ye hide that which is in your breasts or reveal it, Allah knoweth it. He knoweth that which is in the heavens and that which is in the earth, and Allah is Able to do all things.
Surah Aal-i-Imraan(3:29)
Sahih al-Bukhari
Fighting for the Cause of Allah (Jihaad)
Chapter: To invoke Allah to defeat and shake Al-Mushrikun
Narrated Abu Huraira:
The Prophet (ﷺ) used to recite the following invocations during Qunut: "O Allah! Save Salama bin Hisham. O Allah! Save Al-Walid bin Al-Walid. O Allah! Save `Aiyash bin Rabi`a O Allah ! Save the weak Muslims. O Allah! Be very hard on Mudar tribe. O Allah! Afflict them with years (of famine) similar to the (famine) years of the time of Prophet Joseph."
Sahih al-Bukhari 2932