The QDate class provides date functions. ... QDate  ( int y, int m, int d )  . bool  isNull  () const . bool  isValid  () const . ... int  month  () const . int  day  () const . ... virtual const char*  monthName  ( int month ) const . ... QDate  addDays  ( int days ) const . ... Constructs a date with the year y, month m and day d. Returns this date plus ndays days. ... Returns the day of the month (1..31) for this date. ... Returns the number of days in the month (28..31) for this date. ...