1. He has lunch at 12:00 p.m.

Question

2. He has lunch at noon.
3. He has lunch at 12:00 noon.

(Which expressions can we use? Are all OK?
Which one is frequently used?)

4. He has dinner at 17:30.
5. He has dinner at 17:30 p.m.
6. He has dinner at 17:30 o'clock.

(Is only #4 correct? #5 and #6 are wrong, right?)

Answer 1

1-3. All OK.

4-6. Right = only #4. On the 24-hour clock, the 17:30 will tell you it is p.m.

Sra