Get last day of Month

Question

For getting last date of month I have written this function

/**
 * @param month integer value of month
 * @param year integer value of month
 * @return last day of month in MM/dd/YYYY format
 */
private static String getDate(int month, int year) {
    Calendar calendar = Calendar.getInstance();
    // passing month-1 because 0-->jan, 1-->feb... 11-->dec
    calendar.set(year, month - 1, 1);
    calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE));
    Date date = calendar.getTime();
    DateFormat DATE_FORMAT = new SimpleDateFormat("MM/dd/YYYY");
    return DATE_FORMAT.format(date);
}

for all the inputs its working fine with one exception when the month is December, i.e. getDate(12, 2012) returns 12/31/2013 but it should return 12/31/2012. Please explain the behavior and solution too.

Answer 1

Change YYYY to yyyy

DateFormat DATE_FORMAT = new SimpleDateFormat("MM/dd/yyyy");   

YYYY is wrong dateformat

Answer 2

Try this

calendar.add(Calendar.MONTH, month);   calendar.set(Calendar.DAY_OF_MONTH, 1);   calendar.add(Calendar.DATE, -1);    Date date = calendar.getTime(); 

Answer 3

Try to use Joda-Time, it's more simple :

private static String getLastDayOfMonth(int month, int year) {
    LocalDate lastDayOfMonth = new LocalDate(year, month, 1).dayOfMonth().withMaximumValue();
    return lastDayOfMonth.toString("MM/dd/yyyy");
}

Answer 4

private static String getDate(int month, int year) {
    Calendar calendar = Calendar.getInstance();

    calendar.set(Calendar.MONTH, month);
    calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE));

    Date date = calendar.getTime();
    DateFormat DATE_FORMAT = new SimpleDateFormat("MM/dd/yyyy");
    return DATE_FORMAT.format(date);
}