stock mktime(hour, minute, second, day, month, year)
{
        static days_of_month[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
                lMinute, lHour, lDay, lMonth, lYear,
                lMinuteS, lHourS, lDayS, lMonthS, lYearS;
        if (year != lYear)
        {
                lYearS = 0;
                for (new j = 1970; j < year; j++)
                {
                        lYearS += 31536000;
                        if ((!(j % 4) && (j % 100)) || !(j % 400)) lYearS += 86400;
                }
                lYear = year;
        }
        if (month != lMonth)
        {
                lMonthS = 0;
                month--;
                for (new i = 0; i < month; i++)
                {
                        lMonthS += days_of_month[i] * 86400;
                        if ((i == 1) && ((!(year % 4) && (year % 100)) || !(year % 400))) lMonthS += 86400;
                }
                lMonth = month;
        }
        if (day != lDay)
        {
                lDayS = day * 86400;
                lDay = day;
        }
        if (hour != lHour)
        {
                lHourS = hour * 3600;
                lHour = hour;
        }
        if (minute != lMinute)
        {
                lMinuteS = minute * 60;
                lMinute = minute;
        }
        return lYearS + lMonthS + lDayS + lHourS + lMinuteS + second;
}