+ year = y;
+ month = m;
+ mday = d;
+ hour = h;
+ minute = n;
+ second = s;
+ usec = u;
+
+ if(usec>=1000000)
+ throw InvalidParameterValue("Microseconds out of range");
+ if(second>=60)
+ throw InvalidParameterValue("Seconds out of range");
+ if(minute>=60)
+ throw InvalidParameterValue("Minutes out of range");
+ if(hour>=24)
+ throw InvalidParameterValue("Hours out of range");
+ if(month<1 || month>12)
+ throw InvalidParameterValue("Month out of range");
+ if(mday<1 || mday>month_days(year, month))
+ throw InvalidParameterValue("Day of month out of range");
+}
+
+void DateTime::add_days(int days)
+{
+ int new_year = year;