CLIC\SET TIME_ORIGIN *|date
Specify the time origin for the abscissa in time plots. This is
normally the day for which the first data is plotted, and time is
displayed in hours since that day. This day is reset by using
PLOT/RESET.
SET TIME_ORIGIN date forces the time origin to the specified day (e.g.
23-NOV-1995).
SET TIME_ORIGIN * reset the default (automatic) behaviour.