If "good morning" is between 6:00-12:00 PM, and "good afternoon" is between 12:00-6:00 PM then at what time "good day" should be said?

  • 1
    In the US, we solve this problem by not ever saying "Good day". It sounds a little foreign and formal to this US English speaker.
    – stangdon
    Mar 24 '18 at 13:18
  • 1
    @stangdon I live in the US and, while not very common, some people do greet me with "Good day". I know for a fact that some of these people are born, raised, and live in the US.
    – m_a_s
    Mar 24 '18 at 17:31
  • @m_a_s Fair enough! I was being kind of jocular. I honestly don't hear "good day" very much, compared to "good morning" or "good afternoon" (or "good evening" for that matter).
    – stangdon
    Mar 24 '18 at 20:53
  • @stangdon I did appreciate the humor there.
    – m_a_s
    Mar 25 '18 at 19:05

Anytime "during the day" or "daytime": Oxford / Amer. Heritage / Webster
Generally between sunrise and sunset, if you must put a time for it, usually about 6 AM to 6 PM.

So "good day" can be used instead of "good morning" or "good afternoon" but not instead of "good evening".

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