Well, the Hijri date 18 Rajab 1420 corresponds to the Gregorian date Wednesday, 27 October 1999. This date lies in the seventh month of the Hijri year 1420 AH, which is Rajab of 1420 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1420/07/18 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 27 October 1999 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Rajab 1420 AH to its equivalent Gregorian date.
يَكَادُ ٱلْبَرْقُ يَخْطَفُ أَبْصَٰرَهُمْ ۖ كُلَّمَآ أَضَآءَ لَهُم مَّشَوْا۟ فِيهِ وَإِذَآ أَظْلَمَ عَلَيْهِمْ قَامُوا۟ ۚ وَلَوْ شَآءَ ٱللَّهُ لَذَهَبَ بِسَمْعِهِمْ وَأَبْصَٰرِهِمْ ۚ إِنَّ ٱللَّهَ عَلَىٰ كُلِّ شَىْءٍۢ قَدِيرٌۭ
The lightning almost snatcheth away their sight from them. As often as it flasheth forth for them they walk therein, and when it darkeneth against them they stand still. If Allah willed, He could destroy their hearing and their sight. Lo! Allah is able to do all things.
Surah Al-Baqara(2:20)