Java Day End getMonthSpan(Date start, Date end)

Description

This method returns the number of months between the specified dates.

License

Apache License

Parameter

Parameter	Description
start	The start date.
end	The end date.

Return

The number of months between the specified dates.

Declaration

public static int getMonthSpan(Date start, Date end) 

Method Source Code

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

import static java.util.Calendar.DAY_OF_MONTH;

import static java.util.Calendar.HOUR_OF_DAY;
import static java.util.Calendar.MILLISECOND;
import static java.util.Calendar.MINUTE;
import static java.util.Calendar.MONTH;
import static java.util.Calendar.SECOND;
import static java.util.Calendar.YEAR;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class Main {
    /**/*  w w  w .ja v  a  2 s .c  om*/
     * This method returns the number of months between the specified dates.
     *
     * @param start The start date.
     * @param end The end date.
     *
     * @return The number of months between the specified dates.
     */
    public static int getMonthSpan(Date start, Date end) {
        GregorianCalendar first = createCalendar(start);
        GregorianCalendar last = createCalendar(end);
        int monthSpan = 0;

        first.set(DAY_OF_MONTH, 1);

        monthSpan += (last.get(MONTH) - first.get(MONTH));
        monthSpan += 12 * (last.get(YEAR) - first.get(YEAR));

        if (monthSpan < 0) {
            monthSpan = 0;
        }

        return monthSpan;
    }

    /**
     * This method creates and returns a new calendar.
     *
     * @return A new calendar.
     */
    public static GregorianCalendar createCalendar() {
        return createCalendar(null);
    }

    /**
     * This method creates and returns a new calendar.
     *
     * @param date The date to initialize the calendar to.
     *
     * @return A new calendar.
     */
    public static GregorianCalendar createCalendar(Date date) {
        GregorianCalendar calendar = new GregorianCalendar();

        if (date == null) {
            date = new Date();
        }

        calendar.setTime(date);

        clearClockFor(calendar);

        return calendar;
    }

    /**
     * This method sets the clock to 00:00:00:000.
     *
     * @param calendar The calendar to clear the clock for.
     */
    public static void clearClockFor(Calendar calendar) {
        // Set time to 00:00:00:000
        calendar.set(HOUR_OF_DAY, 0);
        calendar.set(MILLISECOND, 0);
        calendar.set(MINUTE, 0);
        calendar.set(SECOND, 0);
    }
}

Related

1. getMonthEndDate(Long day)
2. getMonthFirstDays(Date startDate, Date endDate)
3. getMonths(Date end, Date start)
4. getMonthsBetweenBeginDateAndEndDate(Date beginDate, Date endDate)
5. getMonthSpan(Date begin, Date end)
6. getMsBetween(Date startDate, Date endDate)
7. getNextEndDate(Date date, int offset)
8. getNextSendTime(Date sendDate, Date start)
9. getNumberOfDaysBetweenDates(Date beginDate, Date endDate)