Bug#111268: Svenska språknämnden is a preferrable authority for Swedish as a language
ITS is a TECHNICAL standardisation organisation. Language
standardisation is not their main focus.
The body working on standardising the Swedish language in general is
Svenska språknämnden (http://www.spraknamnden.se/). They have issued
the book "Svenska skrivregler" mentioned above, and this is the
authority I would recommend for these matters. (Usually the two
agree, of course, when talking about the same matters.)
In the case of times, Svenska språknämnden recommends using full stop,
not colons, as in 12.30 or 12.30.35.
When it comes to practical usage, I challenge Mikael Hedin's claim
that colon "definately [is] what people use". You see it in some
computer related circumstances. I would attribute that to LACK of
localisation. If you go outside that field, and look an any
newspaper, timetable, and other places where points of time is
mentioned, full stop is much more common than colon.
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