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;
//License from project: Open Source License 

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

import java.util.Date;

import java.util.Locale;

public class Main {
    private static final SimpleDateFormat FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd");

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

        long duration = getTimeCount(from, to, DATE_FORMAT.toPattern());

        return (int) (duration / (1000 * 60 * 60 * 24));
    }// w  w w .  ja v a  2s .c om

    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;
    }

    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;
    }

    public static Date parse(String datetime) {
        try {
            return FORMAT.parse(datetime);
        } catch (ParseException e) {
            return new Date();
        }
    }

    public static String format(Date date) {
        return FORMAT.format(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)
5. getDaysBetween(Map params)