Abolfazl Sabouri, Abolfazl Sabouri is based in New Zealand and has an MA in Jurisprudence and Islamic Studies. He is a graduate of Elmiyeh seminary in Qom with more than 15 years of study and research where he has... Answered 3 years ago

It is their jurisjurisprudence. It is according to their ahadith and their understanding of the Qur'an.

In verse 187 chapter 2 says continue your fast until night (الليل). Most of the Shia ulama believe it should be dark (to call it night) . 

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