どうですか
#include <time.h>
#include <iostream>
int LastDay (int iMonth, int iYear)
{
struct tm when;
time_t lastday;
// Set up current month
when.tm_hour = 0;
when.tm_min = 0;
when.tm_sec = 0;
when.tm_mday = 1;
// Next month 0=Jan
if (iMonth == 12)
{
when.tm_mon = 0;
when.tm_year = iYear - 1900 + 1;
}
else
{
when.tm_mon = iMonth;
when.tm_year = iYear - 1900;
}
// Get the first day of the next month
lastday = mktime (&when);
// Subtract 1 day
lastday -= 86400;
// Convert back to date and time
when = *localtime (&lastday);
return when.tm_mday;
}
int _tmain(int argc, _TCHAR* argv[])
{
for (int m = 1; m <= 12; m++)
std::cout << "Last day of " << m << " is " << LastDay (m, 2002) << std::endl;
return 0;
}
印刷されます(2002年)...
Last day of 1 is 31
Last day of 2 is 28
Last day of 3 is 31
Last day of 4 is 30
Last day of 5 is 31
Last day of 6 is 30
Last day of 7 is 31
Last day of 8 is 31
Last day of 9 is 30
Last day of 10 is 31
Last day of 11 is 30
Last day of 12 is 31