Aparently the properties and edit dialogues show the time of a point only according to the current computer timezone setting. It would be useful to show the UTC as well. Current local time is confusing if you're looking at tracks that were recorded in a different timezone, for example.
I'm working on this - adding an Alternative Time Display option - shown in a tooltip over where the time is displayed.
Options will be to show either None, UTC or the Time in the timezone the track/item was recorded.
Unfortunately the last option is a little complicated to determine the Timezone from a position due to the political nature of each country/region choosing it's timezone(s).
I'm planning to use a position lookup (KD Tree algorithm) against the nearest city to determine the Timezone - as this data is available from Geonames.org - e.g. using the file cities1500.txt).
Trying to perform an is_in country search is much more complicated for me to implement, so I think the above nearest city method should suffice.
Included in Viking 1.6 release.