Tools.h++ Class Reference

is negative for zones east of Greenwich, England.
virtual int
altZoneOffset() const = 0;
Returns the number of seconds west of UTC for daylight-saving time in this zone.
virtual RWBoolean
daylightObserved() const = 0;
Returns TRUE if daylight-saving time is observed for this zone.
virtual RWBoolean
isDaylight(const struct tm* tspec) const = 0;
Returns TRUE if the time and date represented in the struct tm argument is in the range
of daylight-saving time for this zone. The elements of the tm argument must all be
self-consistent; in particular, the tm_wday member must agree with the tm_year,
tm_mon, and tm_day members.
virtual void
getBeginDaylight(struct tm*) const = 0;
virtual void
getEndDaylight (struct tm*) const = 0;
Return with the struct tm argument set to the local time that daylight-saving time begins,
or ends, for the year indicated by the tm_year member passed in. If daylight-saving time
is not observed, the struct tm members are all set to a negative value. Note that in the
southern hemisphere, daylight-saving time ends at an earlier date than it begins.
virtual RWCString
timeZoneName() const = 0;
virtual RWCString
altZoneName() const = 0;
Return the name of, respectively, the standard and daylight-saving time zones
represented, such as "PST" and "PDT". Note that the current date and time have no effect
on the return values of these functions.
Static Public Member Functions
static const RWZone&
local();
Returns a reference to an RWZone representing local time. By default this will be an
instance of RWZoneSimple created with offsets and zone names from the operating
system, with U.S. rules for daylight-saving time if observed. This is used as the default
argument value for RWDate and RWTime functions that take an RWZone.
static const RWZone&
standard();