Number of days in particular month of particular year

// Create a calendar object and set year and month

Calendar mycal = new GregorianCalendar(1999, Calendar.FEBRUARY, 1);

// Get the number of days in that month
int daysInMonth = mycal.getActualMaximum(Calendar.DAY_OF_MONTH); // 28

// Try month in a leap year
mycal = new GregorianCalendar(2000, Calendar.FEBRUARY, 1);
daysInMonth= mycal.getActualMaximum(Calendar.DAY_OF_MONTH);     // 29