If a person broke his fast without being certain that the sun had set, he has to make up his fasts!

If you broke your fast thinking it was time (but were not certain) and you did not find out afterwards that you were wrong, do you have to make up for that day? Apparently, many scholars have said that it is not necessary, due to the fact that you did not know whether you broke your fast too early or not (you’re having doubts with no certainty), but I am wondering if that is the correct opinion.

Fasting | August 9, 2015 4:13 pm
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For my case, will it be sins of shirk or sins of intercourse during day of Ramadan if i did not pay my expiation intentionally.
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Is it permissible to fast continuously, I don’t mean al wisal, I mean a regular nafl fast everyday.I am a girl so I would not fast everyday because I can’t fast for a few days each month because of my menses. And I would not fast on forbidden days, this isn’t literally perpetually right?