Java Month Convert setMonths(Date date, int amount)

Description

Sets the months field to a date returning a new object.

License

Apache License

Parameter

Parameter	Description
date	the date, not null
amount	the amount to set

Exception

Parameter	Description
IllegalArgumentException	if the date is null

Return

a new Date object set with the specified value

Declaration

public static Date setMonths(Date date, int amount) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Main {
    public static SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");

    /**/*from w  ww.j a  v  a  2s.  c om*/
     * Sets the months field to a date returning a new object.
     * The original date object is unchanged.
     *
     * @param date  the date, not null
     * @param amount the amount to set
     * @return a new Date object set with the specified value
     * @throws IllegalArgumentException if the date is null
     * @since 2.4
     */
    public static Date setMonths(Date date, int amount) {
        return set(date, Calendar.MONTH, amount);
    }

    /**
     * Sets the specified field to a date returning a new object.  
     * This does not use a lenient calendar.
     * The original date object is unchanged.
     *
     * @param date  the date, not null
     * @param calendarField  the calendar field to set the amount to
     * @param amount the amount to set
     * @return a new Date object set with the specified value
     * @throws IllegalArgumentException if the date is null
     * @since 2.4
     */
    private static Date set(Date date, int calendarField, int amount) {
        if (date == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        // getInstance() returns a new object, so this method is thread safe.
        Calendar c = Calendar.getInstance();
        c.setLenient(false);
        c.setTime(date);
        c.set(calendarField, amount);
        return c.getTime();
    }

    public static String getTime(String pattern) {
        return new SimpleDateFormat(pattern).format(new Date());
    }
}

Related

1. monthStringToInt(String month)
2. nextMonth()
3. nextMonth(Date date)
4. nextMonth(Date date)
5. parseMonth(final String source)