Tools.h++ Manual

21-90 104011 Tandem Computers Incorporated
21
RWDate
Synopsis #include <rw/rwdate.h>
RWDate a; // Construct today's date
Description Class RWDate represents a date, stored as a Julian day number. The member
function isValid() can be used to determine whether an RWDate is a valid
date. For example, isValid() would return FALSE for the date 29 February
1991 because 1991 is not a leap year.
RWDate 's can be converted to and from RWTime 's, and to and from the
Standard C library type struct tm defined in <time.h> .
Note that because the default constructor for this class creates an instance
holding the current date, constructing a large array of RWDate may be slow. If
this is an issue, declare your arrays with a class derived from RWDate that
provides a faster constructor.
class FastDate : public RWDate
{
public:
FastDate() : RWDate(0) {;}
//Constructs an “invalid” date by default
};
Example
#include <rw/rwdate.h>
#include <rw/rstream.h>
main()
{
// Today's date
RWDate d;
// Last Sunday's date:
RWDate lastSunday = d.previous("Sunday");
cout << d << endl << lastSunday << endl;
}