time.cpp

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#include <time.h>
 
unsigned long mktime(const unsigned int year, const unsigned int month,
                     const unsigned int day, const unsigned int hour,
                     const unsigned int min, const unsigned int sec)
{
    unsigned int monthVal = month, yearVal = year;
 
    // 1..12 -> 11,12,1..10
    if( 0 >= (int) (monthVal -= 2))
    {
        monthVal += 12; // Puts Feb last since it has leap day
        yearVal -= 1;
    }
 
    return ((((unsigned long)
                (yearVal/4 - yearVal/100 + yearVal/400 + 367*monthVal/12 + day) +
                yearVal*365 - 719499
            )*24 + hour // now have hours
        )*60 + min // now have minutes
    )*60 + sec; // finally seconds
}