Java Date Difference dateDiff(Date d1, Date d2, int field)

Description

date Diff

License

Apache License

Declaration

public static long dateDiff(Date d1, Date d2, int field) 

Method Source Code

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

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

public class Main {

    public static long dateDiff(Date d1, Date d2, int field) {
        long j = 1;
        switch (field) {
        case Calendar.YEAR:
            return dateDiffYear(d1, d2);
        case Calendar.MONTH:
            return dateDiffMonth(d1, d2);
        case Calendar.DATE:
            j = 1000 * 60 * 60 * 24;// w  w  w  . j  a v a 2 s  . c  o m
            break;
        case Calendar.HOUR:
            j = 1000 * 60 * 60;
            break;
        case Calendar.MINUTE:
            j = 1000 * 60;
            break;
        case Calendar.SECOND:
            j = 1000;
            break;

        default:
            return 0;
        }
        long diff = d1.getTime() - d2.getTime();
        return diff / j;
    }

    public static long dateDiffYear(Date d1, Date d2) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(d1);
        int i = calendar.get(Calendar.YEAR);
        calendar.setTime(d2);
        int j = calendar.get(Calendar.YEAR);

        return i - j;
    }

    public static long dateDiffMonth(Date d1, Date d2) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(d1);
        int y1 = calendar.get(Calendar.YEAR);
        int m1 = calendar.get(Calendar.MONTH);
        calendar.setTime(d2);
        int y2 = calendar.get(Calendar.YEAR);
        int m2 = calendar.get(Calendar.MONTH);

        return (y1 - y2) * 12 + m1 - m2;
    }

    public static Date getTime(String date) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return sdf.parse(date);
    }

    public static int get(Date date, int field) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(field);
    }
}

Related

1. dateDiff(Date beginDate, Date endDate)
2. dateDiff(Date date1, Date date2)
3. dateDiff(Date date1, Date date2)
4. dateDiff(Date date1, Date date2)
5. dateDiff(Date fromDate, Date toDate)