Well, the Hijri date 18 Rabi Al Thani 1290 corresponds to the Gregorian date Saturday, 14 June 1873. This date lies in the fourth month of the Hijri year 1290 AH, which is Rabi Al-Thani of 1290 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1290/04/18 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 14 June 1873 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Rabi Al Thani 1290 AH to its equivalent Gregorian date.
وَإِن كَانَ ذُو عُسْرَةٍۢ فَنَظِرَةٌ إِلَىٰ مَيْسَرَةٍۢ ۚ وَأَن تَصَدَّقُوا۟ خَيْرٌۭ لَّكُمْ ۖ إِن كُنتُمْ تَعْلَمُونَ
And if the debtor is in straitened circumstances, then (let there be) postponement to (the time of) ease; and that ye remit the debt as almsgiving would be better for you if ye did but know.
Surah Al-Baqara(2:280)
