This: Traveling During Ramadan: Should I Still Fast? made me think about the following question:
What if a person -like somebody who is on a journey during Ramadan- who had the choice not to fast, but decided to fast before the end of the day broke his/her fast.
This person started the day fasting in Ramadan (even if he/she had the permission to eat), but later maybe due to heat or whatever reason decided to break his/her fast before the sunset.
What are the views of scholars about this: Do they need only to fast that day as qada' or is a kafara necessary ...?