Is it required to make the intention the night before for fasting the six days of Shawwal?

The questioner asks: Is it required to make the intention the night before for fasting the six days of Shawwal? And if a person wakes up in the late morning on one of the days of Shawwal and has not eaten anything, is the fasting of that day counted?
Voluntary fasting does not require making the intention the night before. If one fasts from the middle of the day, there is no harm; it will be incomplete. If one fasts from the beginning of the day, that is better and more complete. If one only fasts from the middle of the day, his fasting is incomplete.