Tools.h++ Manual

104011 Tandem Computers Incorporated 21-233
21
RWZone
Synopsis #include <time.h>
#include <rw/zone.h>
(abstract base class)
Description RWZone is an abstract base class. It defines an interface for time zone issues
such as whether or not daylight savings time is in use, the names and offsets
from UTC (also known as GMT) for both standard and daylight savings times,
and the start and stop dates for daylight savings time, if used.
Note – that because it is an abstract base class, there is no way to actually
enforce these goals—the description here is merely the model of how a class
derived from RWZone should act.
Most programs interact with RWZone only by passing an RWZone reference to
an RWTime or RWDate member function that expects one.
RWZoneSimple is an implementation of the abstract RWZone interface
sufficient to represent U.S.A. daylight savings time rules. Three instances of
RWZoneSimple are initialized from the global environment at program startup
to represent local, standard, and universal time. They are available via calls to
the static member functions RWZone::local(), RWZone::standard() ,
and RWZone::utc() , respectively. See the class RWZoneSimple for details.
Example
#include <rw/zone.h>
#include <rw/rwtime.h>
#include <rw/rstream.h>
main() {
RWTime now;
cout << now.asString(RWZone::local()) << endl;
cout << now.asString(RWZone::utc()) << endl;
return 0;
}