Question: how do you write 12 noon on an invitation?
Answer: If using capital letters, “AM” or “PM”, periods are not necessary. Noon – When using the time of noon for your event, use any of the following: “12 o'clock”, “12:00 PM”, “12:00 p.m.” or “noon”. “12 o'clock noon” or “12 noon” should not be used as these phrases are redundant.