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Well , I know what does "Call it a night" mean, but I wanted to know if I could say "call it a day". E.g I'm working on a project in my office. And suddenly my parents call me up, can I say "let's call it a day " here?

marked as duplicate by Mark, user6951, Lucian Sava, Man_From_India, Chenmunka Jan 30 '15 at 12:28

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Call it a day and call it a night are both idioms. If you stop doing something for the rest of the day, you call it a day. On the other hand, if you stop working for the rest of the night, you call it a night (The Free Dictionary). They are not interchangeable.

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