So, at what time would you say "How [i]was[/i] your day" instead of "How [i]is[/i] your day"?
I say, about, eh, 9:00 PM?
What do you say?
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I just go for the "How's your day been?" if it's after noon, with "morning" in place of "day" before noon. After about 8, it becomes "night" instead of "day."