Java Get end-of-month date

Java End of month dateRetrieve the Calendar.getActualMaximum()

Javaof the date specified inEnd of month dateThe following is a sample program to obtain
CalendarClassgetActualMaximum(Calendar.DATE)indicates certainty, emphasis, etc.End of month datecan be obtained.

sample program

/**
 * Returns the end-of-month date in the given date string (yyyy/MM/dd or yyyy-MM-dd)
 * Returns the last day of the month in
 *
 * @param strDate target date string
 * @return end-of-month date
 */
public static int getLastDay(String strDate) {
    if (strDate == null || strDate.length() ! = 10) {
        throw new IllegalArgumentException(
                "The argument string ["+ strDate +"]" +
                "]" is invalid.") ;
    }
    int yyyy = Integer.parseInt(strDate.substring(0,4));
    int MM = Integer.parseInt(strDate.substring(5,7)); }
    int dd = Integer.parseInt(strDate.substring(8,10)); int
    Calendar cal = Calendar.getInstance();
    cal.set(yyyy,MM-1,dd);
    int last = cal.getActualMaximum(Calendar.DATE);
    return last; }
}

Execution Result

◆Example of Execution

public static void main(String[] args) {
    System.out.println(getLastDay("2007/01/01"));
    System.out.println(getLastDay("2007/02/01"));
    System.out.println(getLastDay("2008/02/01"));
}

◆Output result

31
28
29

*Because 2008 is a leap year, the last day of February is the 29th.