Yet another (different) bug in Adjust Time dialog

["Dotan Cohen" <dotancohen gmail com>]

I once again tried to adjust the time on a series of photos. This
time, I tried to move the time back one hour. But there was a
dicrepancy between the Difference field and the Action field. To get
-01:00:00 in the Action field, I had to make the Difference field
-1:01:00. Note that I did in fact make the change as such, and the
photos were in fact moved back exactly one hour. See screenshot:
http://dotancohen.com/time_error2.png

I should note that I'm on the latest stable version (v0.2.1), that I
built from source.

Dotan Cohen