Java Date Between daysBetween(Date smdate, Date bdate)

Description

days Between

License

Apache License

Parameter

Parameter	Description
smdate	a parameter
bdate	a parameter

Exception

Parameter	Description
ParseException	an exception

Declaration

public static int daysBetween(Date smdate, Date bdate) throws ParseException 

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 final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
    public static final String DATE_PATTERN = "yyyy-MM-dd";

    public static int daysBetween(Date smdate, Date bdate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        smdate = sdf.parse(sdf.format(smdate));
        bdate = sdf.parse(sdf.format(bdate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);/*from w w  w  .ja v  a2 s  .  c  om*/
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);
        return Integer.parseInt(String.valueOf(between_days));
    }

    public static Date parse(String str, String formatPattern) {
        try {
            return new SimpleDateFormat(formatPattern).parse(str);
        } catch (ParseException e) {
            throw new RuntimeException("could not parse date: " + str + " LEGACY_FORMAT = "
                    + new SimpleDateFormat(formatPattern).toPattern(), e);
        }
    }

    public static Date parse(String str) {
        if (str.length() != DATE_PATTERN.length() && str.length() != DATE_TIME_PATTERN.length()) {
            return null;
        }
        String formatPattern = DATE_PATTERN;
        if (str.length() > 10) {
            formatPattern = DATE_TIME_PATTERN;
        }

        try {
            return new SimpleDateFormat(formatPattern).parse(str);
        } catch (ParseException e) {
            throw new RuntimeException("could not parse date: " + str + " LEGACY_FORMAT = "
                    + new SimpleDateFormat(formatPattern).toPattern(), e);
        }
    }

    public static String format(Date date, String formatPattern) {
        // Assert.notNull(date);
        return new SimpleDateFormat(formatPattern).format(date);
    }
}

Related

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3. daysBetween(Date date1, Date date2)
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