Worth checking out Haven Bros. in Providence, RI for an example of this still in operation. Open from ~16:30 to ~27:00. It is driven in to down city every evening.
I miss getting out of a concert at Lupo's or the Strand, and getting hotdogs at Haven Bros. They have outlasted many concert venues in Providence.
Never encountered it in half a century here, just military time "0 3 hundred" as used on the shipping forecast, or simply 3am.
Never seen it in the UK.
Theo only time I have come across is when I had to count the hours between two times in an excel sheet & found that by default MS Excel formats 25:00 hours to 01:00 & I need to use [hh]:mm to bring it to 25:00
I've lived in Scotland and England most of my life, and can't recall ever having seen it and am now curious about what these special contexts are.
is the same as
(–8):30 to 03:00