Well, the Hijri date 26 Rabi Al Thani 1400 corresponds to the Gregorian date Thursday, 13 March 1980. This date lies in the fourth month of the Hijri year 1400 AH, which is Rabi Al-Thani of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1400/04/26 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 13 March 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Rabi Al Thani 1400 AH to its equivalent Gregorian date.
ٱلَّذِينَ يَلْمِزُونَ ٱلْمُطَّوِّعِينَ مِنَ ٱلْمُؤْمِنِينَ فِى ٱلصَّدَقَٰتِ وَٱلَّذِينَ لَا يَجِدُونَ إِلَّا جُهْدَهُمْ فَيَسْخَرُونَ مِنْهُمْ ۙ سَخِرَ ٱللَّهُ مِنْهُمْ وَلَهُمْ عَذَابٌ أَلِيمٌ
Those who point at such of the believers as give the alms willingly and such as can find naught to give but their endeavours, and deride them - Allah (Himself) derideth them. Theirs will be a painful doom.
Surah At-Tawba(9:79)
Sahih al-Bukhari
Fasting
Chapter: Observing Saum (fasting) daily throughout the life.
Narrated `Abdullah bin `Amr:
Allah's Messenger (ﷺ) was informed that I had taken an oath to fast daily and to pray (every night) all the night throughout my life (so Allah's Messenger (ﷺ) came to me and asked whether it was correct): I replied, "Let my parents be sacrificed for you! I said so." The Prophet (ﷺ) said, "You can not do that. So, fast for few days and give it up for few days, offer Salat (prayer) and sleep. Fast three days a month as the reward of good deeds is multiplied ten times and that will be equal to one year of fasting." The Prophet (ﷺ) said to me, "Fast one day and give up fasting for two days." I replied, "I can do better than that." The Prophet (ﷺ) said to me, "Fast one day and give up fasting for a day and that is the fasting of Prophet David and that is the best fasting." I said, "I have the power to fast better (more) than that." The Prophet (ﷺ) said, "There is no better fasting than that."
Sahih al-Bukhari 1976