On Sunday, 18 October 2020 09:49:26 UTC+1, PeterC wrote:


Somehow I prefer that - the 25h way of giving times is too long-winded and
too precise: oh-eight-hundred-hours versus eight, with morning etc. if
needed. Most day-to-day times don't matter a damn to a minute or few, that's
one reason that I like analogue clocks - I don't want to know the time of
day, just how long until..., so a quick glance for how long 'til the 'bus
goes is enough.

It just started one day, years ago, I think one of us started to say eighteen-hundred - and just diverted to saying 18 o'clock because we got bored with the overly pedantic feeling of that halfway through saying it.

I can't see any reason NOT to say "o'clock". (Except the literal failure to display 13 to 24 on a physical 12-hour clock!)