Invalid elapsed time calculation

[kindkaktus]

Email:
from: vertaalpraktijk@korostelev.net
to: andrei@korostelev.net
date: Tue, May 19, 2015 at 6:38 AM
subject: Integration status for VertaalPraktijk: FAILED

3 tasks SUCCEEDED of which 0 have WARNINGs, 2 tasks FAILED
Elapsed time: -1 day(s), 17 hour(s), 57 min, 26 sec

[kindkaktus]

Seems to be a problem with server time. time.perf_counter() can be used instead to measure process time irrespective external timer though this is not of high importance.