Java Day Count getDayCount(String from, String to)

Description

get Day Count

License

Open Source License

Declaration

public static int getDayCount(String from, String to) throws ParseException 

Method Source Code

//package com.java2s;
/*// www  .ja va  2s.c  o m
 * M2M ServiceFOTA ONM version 1.0
 *
 *  Copyright ? 2014 kt corp. All rights reserved.
 *
 *  This is a proprietary software of kt corp, and you may not use this file except in
 *  compliance with license agreement with kt corp. Any redistribution or use of this
 *  software, with or without modification shall be strictly prohibited without prior written
 *  approval of kt corp, and the copyright notice above does not evidence any actual or
 *  intended publication of such software.
 */

import java.text.ParseException;
import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

public class Main {

    public static int getDayCount(String from, String to) throws ParseException {

        return getDayCountWithFormatter(from, to, "yyyyMMdd");
    }

    public static int getDayCountWithFormatter(String from, String to, String format) throws ParseException {

        long duration = getTimeCount(from, to, format);

        return (int) (duration / (1000 * 60 * 60 * 24));
    }

    public static long getTimeCount(String from, String to) throws ParseException {

        String format = getFormatStringWithDate(from);

        return getTimeCount(from, to, format);
    }

    public static long getTimeCount(String from, String to, String format) throws ParseException {

        Date d1 = dateFormatCheck(from, format);
        Date d2 = dateFormatCheck(to, format);

        long duration = d2.getTime() - d1.getTime();

        return duration;
    }

    protected static String getFormatStringWithDate(String date) throws ParseException {
        String format = null;

        if (date.length() == 4) {
            format = "HHmm";
        } else if (date.length() == 8) {
            format = "yyyyMMdd";
        } else if (date.length() == 12) {
            format = "yyyyMMddHHmm";
        } else if (date.length() == 14) {
            format = "yyyyMMddHHmmss";
        } else if (date.length() == 17) {
            format = "yyyyMMddHHmmssSSS";
        } else if (date.length() == 19) {
            format = "yyyy/MM/dd HH:mm:ss";
        } else {
            throw new ParseException(" wrong date format!:\"" + format + "\"", 0);
        }

        return format;
    }

    public static Date dateFormatCheck(String source) throws ParseException {

        return dateFormatCheck(source, "yyyyMMdd");
    }

    public static Date dateFormatCheck(String source, String format) throws ParseException {

        if (source == null) {
            throw new ParseException("date string to check is null", 0);
        }

        if (format == null) {
            throw new ParseException("format string to check date is null", 0);
        }

        SimpleDateFormat formatter = new SimpleDateFormat(format, Locale.KOREA);

        Date date = null;

        try {
            date = formatter.parse(source);
        } catch (ParseException e) {
            throw new ParseException(" wrong date:\"" + source + "\" with format \"" + format + "\"", 0);
        }

        if (!formatter.format(date).equals(source)) {
            throw new ParseException("Out of bound date:\"" + source + "\" with format \"" + format + "\"", 0);
        }

        return date;
    }
}

Related

1. getDayCount(String from, String to)
2. getDayCount(String yyyy_mm_dd_1, String yyyy_mm_dd_2)
3. GetDays(String strStartDate, String strEndDate)
4. getDaysBetween(Calendar d1, Calendar d2)