We have 37s of leap second but we were showing without usec the
following which could be seen as a wrong leap second offset.

WR time (TAI):     2019-03-15 05:40:48.006697
Switch time (UTC): 2019-03-15 05:40:10.975551

localtime has also been replaced by gmtime (TAI should never be
converted using localtime in case TZ variable is set)

Conflicts:
	userspace/tools/wr_mon.c