add dive implementation pushed

[Jef Driesen]

On 2013-09-20 16:08, Dirk Hohndel wrote:
> On Fri, 2013-09-20 at 09:04 -0500, Thiago Macieira wrote:
> I recommend we work with the dates like Git does:
> - let the user input them as local time
> - use QDateTime to convert to universal time + offset
> - store as universal time + offset
> 
> No - that doesn't work in the context of a divelog. Divecomputers
> universally use localtime. Some claim to have TZ offsets (like the
> Uemis), but that's just "FYI". All time stamps are always local time.

That's not 100% correct. There are a few dive computers (reefnet and 
uwatec) that rely on the host clock to convert from "device" time to 
"human" time. Currently libdivecomputer assumes the downloaded dives 
where done in the same timezone as the host system. But that is not 
necessary correct. For example, if I'm on a diving trip in some 
different timezone and download the dives when I'm back home, using 
localtime is simply wrong. What you get here is in fact utc time, and 
ultimately the user has to tell us the timezone to convert that to 
localtime at the dive site!

Jef