24-hour clock is stickier than Gorilla Glue (r)

Thanks so much for this but i think i mentioned having tried all the obvious solutions given me when searching in Apple support. I also went the System Preferences > Language & Region > Advanced button > Times button but it really only gives me the same selections as the route you mentioned. I have restarted each time (actually only 2 time - didn't want to fit the classic definition of insanity) i tried this page with no luck. And i agree, this does seem bizarre but it is frustrating the hello out of me. Thanks.

Thank you, Luis! I like the clock being in the menu bar. What i don't like is it being a 24-hour clock. I have tried what you suggest - i.e. from System Preferences unchecking the Time Format 24-hour Time - with no effect whatsoever. Strange but true.

Great thought, Luis, thank you. i will give it a try when home and let you know.