Tools.h++ Manual

7-2 104011 Tandem Computers Incorporated

7.2 Constructors

RWTime

may be constructed in several ways:

1. Construct a

RWTime

with the local time:

RWTime t;

2. Construct a

RWTime

with today's date, at the speciﬁed local hour (0–23),

minute (0–59) and second (0–59):

RWTime t(16, 45, 0); //today 16:45:00

3. Construct a

RWTime

for a given date and local time:

RWDate d(2, "June", 1952);

RWTime t(d, 16, 45, 0); // 6/2/52 16:45:003.

4. Construct a

RWTime

for a given date and time zone:

RWDate d(2, “June”, 1952);

RWTime t(d, 16, 45, 0, RWZone::utc()); // 6/2/52

16:45:00

7.3 Member functions

Class

RWTime

has member functions to compare, store, restore, add and

subtract

RWTime

s. An

RWTime

may return hour, minute or second, or ﬁll a

struct tm for any time zone. A complete list of member functions is included

in Class Reference, Part 2

For example, a code fragment to output the hour in local and Universal (GMT)

zones, and then the complete local time and date, is:

RWTime t;

cout << t.hour() << endl;

cout << t.hour(RWZone::utc()) << endl;

cout << t.asString(‘c’) << endl;

Here is how you ﬁnd out when daylight savings time starts for the current year

and local time zone: