This component converts the clock time to local civil time. The
parameter timZon represents the time zone of the
facility (relative to Greenwich Mean Time or the 0th meridian).
Time zones west of GMT (e.g. North America) are represented as
negative; east of GMT as positive. Fraction of hours are
represented in decimals (e.g. for 6:30, use 6.5).
The formula is based on Michael Wetter's thesis (A4.1):
locTim = greTim + (lon*180/pi)*86400/360 = cloTim - timZon + lon*43200/pi
diff.