Wrong duration calculation if a flight goes over date change

[ubx]

For example:
http://www.onlinecontest.org/olc-2.0/gliding/flightinfo.html?flightId=-1483878468

[ubx]

Here is another example:
http://www.onlinecontest.org/olc-2.0/gliding/flightinfo.html?dsId=1610663