Good afternoon time: The appropriate time to

The appropriate time to say " good afternoon " is typically from 12:00 PM to 5:59 PM. Can I use Have a good /nice/great day/ afternoon /evening t o close an email? I often read and write "Have a nice day/ afternoon " but I wonder if, after 5 pm or so, it is appropriate to say "Have a good evening" to close an email. Although the formers read good to me, the latter sounds a bit to colloquial in an office context. Thanks! People say, " Good evening," when you greet someone in the evening. Do you still say, " Good evening," when you meet someone after twelve midnight and before dawn? In Japan, professional musicians and other entertainers always say, " Good morning," regardless of time . Is this the same in English-speaking countries? It is appropriate to say " good afternoon " from 12:00 PM until around 5:00 PM.