Java Date Format As formatDateWithMilliseconds(DateFormat aFormat, Date aDate)

Description

Performs date formatting using the provided format, but injects millisecond precision if the millisecond value is not "000".

License

Open Source License

Parameter

Parameter	Description
aFormat	the base format
aDate	the date to format

Return

the formatted string

Declaration

public static String formatDateWithMilliseconds(DateFormat aFormat, Date aDate) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2013 Rene Schneider, GEBIT Solutions GmbH and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *******************************************************************************/

import java.lang.reflect.Field;
import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

public class Main {
    /**/*w  w  w .  ja  va 2 s .c o m*/
     * Performs date formatting using the provided format, but injects millisecond precision if the millisecond value is
     * not "000". This is intended to be used with the standard date/time formats returned by DateFormat factory
     * methods, which don't include milliseconds in most cases unfortunately. It employs a rather ugly hack to enhance
     * the pattern which only works with {@link SimpleDateFormat}, but as far as I know there's no better method to
     * achieve this result.
     * 
     * @param aFormat
     *            the base format
     * @param aDate
     *            the date to format
     * @return the formatted string
     */
    public static String formatDateWithMilliseconds(DateFormat aFormat, Date aDate) {
        DateFormat tempFormat = aFormat;

        if (aDate.getTime() % 1000 != 0) {
            if (aFormat instanceof SimpleDateFormat) {
                Field tempField;
                try {
                    tempField = SimpleDateFormat.class.getDeclaredField("pattern");
                    tempField.setAccessible(true);
                    String tempPattern = (String) tempField.get(aFormat);

                    tempPattern = tempPattern.replace(":ss", ":ss.SSS");

                    tempFormat = new SimpleDateFormat(tempPattern);
                } catch (SecurityException exc) {
                    exc.printStackTrace();
                } catch (NoSuchFieldException exc) {
                    exc.printStackTrace();
                } catch (IllegalArgumentException exc) {
                    exc.printStackTrace();
                } catch (IllegalAccessException exc) {
                    exc.printStackTrace();
                }
            }
        }

        return tempFormat.format(aDate);
    }
}

Related

1. formatDateToUTC(final Date date)
2. formatDateUsingW3C(Date date)
3. formatDateUTC(Date d)
4. formatDateUTC(Date date)
5. formatDateW3C(Date date)
6. formatDateYMD(Object date)
7. formatDateYyyymmddhhmmss(Date date)
8. formatDatum(Date date, Locale locale)
9. formatDay(Date date)