11:59 p.m.

A time used to avoid disambiguation of today/tomorrow when dealing with midnight.

Me: I need you to finish this before Friday 11:59 p.m.
You: Ok sure.
vs
Me: I need you to finish this before Friday Midnight
You: er, so hand it in on thursday or friday?
Me: ... Friday...
You: But Isn't midnight the first moment of the day?
Me: Shuddup.

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