What does Buddhist fasting day mean? What day is today?

Buddhism has the saying of "fasting for six days" and "fasting for ten days". According to Buddhist scriptures, it will be especially auspicious to do good deeds, fast and recite Buddha in these days. China folk fast, usually on the first day of the first month and the fifteenth day of the first month, also comes from these two fast days in Buddhism:

Ramadan in June-the 8th, 14, 15, 23, 29, 30 days of each month (from Youposai Sutra)?

October-the first, eighth, fourteenth, fifteenth and eighteenth day of each month? Twenty-three twenty-four? 28 years old? 29 years old? Thirty (from Tibetan scriptures)