Is 1.30 pm BrE, and 1:30 pm AmE?

[Kohyoongliat]

1.30 pm, 1:30 pm

Is the first version (with a period) British English and the second (with a colon) American English?

Thanks.

[Anglophile]

I think the first is used for a 12-hour-clock format and the second a 24-hour-clock format.
In either case ante meridiem is abbreviated as a.m. and post meridiem as p.m. Periods seem to justify the disctinction between a.m. and am (the verb).

[Torsten]

Google Calendar, which is a widely used application uses the following format which I stick to too: 1:30pm