Java Hour Format formatDate(java.util.Date dtFormat, String sFormatString)

Description

Format dates, convenience method

License

Open Source License

Parameter

Parameter	Description
dtFormat	a parameter
sFormatString	a parameter

Declaration

public static String formatDate(java.util.Date dtFormat, String sFormatString) 

Method Source Code

//package com.java2s;
/** ***************************************************************
Util.java// w  w w .ja  v a 2 s  . com
Copyright (C) 2001  Brendon Upson 
http://www.wnc.net.au info@wnc.net.au
    
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
    
 *************************************************************** */

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;
import java.util.TimeZone;

public class Main {
    public static final String SHORT_DATE = "shortdate";
    public static final String LONG_DATE = "longdate";
    public static final String SHORT_DATE_TIME = "shortdatetime";
    public static final String LONG_DATE_TIME = "longdatetime";

    /**
     * Format dates, convenience method
     * @param dtFormat
     * @param sFormatString
     * @return
     */
    public static String formatDate(java.util.Date dtFormat, String sFormatString) {
        return formatDate(dtFormat, sFormatString, Locale.getDefault(), TimeZone.getDefault());
    }

    /**
     * Convert a date into a formatted String. This will automatically do the timezone
     * conversion too.
     * To convert to a GMT string:
     * puakma.util.Util.formatDate(new java.util.Date(), "EEE, dd MMM yyyy HH:mm:ss z", Locale.UK, TimeZone.getTimeZone("GMT"));
     *
     * @param dtFormat Date to format; dtFormat; Locale (for languages); TimeZone
     * @param sFormatString
     * @param locale may be null
     * @param tz may be null
     * @return the string representation of the date of "" if the date could not be converted
     */
    public static String formatDate(Date dtFormat, String sFormatString, Locale locale, TimeZone tz) {
        if (sFormatString == null)
            sFormatString = "";

        if (dtFormat == null)
            return "";

        if (sFormatString.indexOf("date") >= 0) {
            // shortdate, longdate etc
            if (sFormatString.equalsIgnoreCase(SHORT_DATE)) {
                DateFormat df = null;
                if (locale != null)
                    df = DateFormat.getDateInstance(DateFormat.SHORT, locale);
                else
                    df = DateFormat.getDateInstance(DateFormat.SHORT);
                if (tz != null)
                    df.setTimeZone(tz);
                return df.format(dtFormat);
            }

            if (sFormatString.equalsIgnoreCase(SHORT_DATE_TIME)) {
                DateFormat df = null;
                if (locale != null)
                    df = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT, locale);
                else
                    df = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
                if (tz != null)
                    df.setTimeZone(tz);
                return df.format(dtFormat);
            }

            if (sFormatString.equalsIgnoreCase(LONG_DATE)) {
                DateFormat df = null;
                if (locale != null)
                    df = DateFormat.getDateInstance(DateFormat.LONG, locale);
                else
                    df = DateFormat.getDateInstance(DateFormat.LONG);
                if (tz != null)
                    df.setTimeZone(tz);
                return df.format(dtFormat);
            }

            if (sFormatString.equalsIgnoreCase(LONG_DATE_TIME)) {
                DateFormat df = null;
                if (locale != null)
                    df = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.SHORT, locale);
                else
                    df = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.SHORT);
                if (tz != null)
                    df.setTimeZone(tz);
                return df.format(dtFormat);
            }
            //we should never get here...
        }

        //regular formatting, eg "dd/MM/yy"
        SimpleDateFormat sdf;
        if (sFormatString.length() == 0)
            sdf = new SimpleDateFormat();
        else {
            if (locale == null)
                sdf = new SimpleDateFormat(sFormatString);
            else
                sdf = new SimpleDateFormat(sFormatString, locale);
        }
        if (tz != null)
            sdf.setTimeZone(tz);

        try {
            return sdf.format(dtFormat);
        } catch (Exception p) {
        }

        return "";
    }

    /**
     * Returns the position of one byte array within another.
     * @param src
     * @param find
     * @return -1 if not found
     */
    public static int indexOf(byte src[], byte find[]) {
        if (src == null || find == null || find.length == 0)
            return -1;
        int i = -1;
        for (i = 0; i < src.length; i++) {
            if (src[i] == find[0]) {
                boolean bOK = true;
                for (int k = 0; k < find.length; k++) {
                    int iSrcPos = i + k;
                    if (iSrcPos >= src.length)
                        return -1;
                    if (src[iSrcPos] != find[k])
                        bOK = false;
                } //for k
                if (bOK)
                    return i;
            }
        } //for i

        return -1;
    }

    /**
     * Returns the position of one byte array within another.
     * @param src
     * @param find
     * @return -1 if not found
     */
    public static int indexOf(char src[], char find[]) {
        if (src == null || find == null || find.length == 0)
            return -1;
        int i = -1;
        for (i = 0; i < src.length; i++) {
            if (src[i] == find[0]) {
                boolean bOK = true;
                for (int k = 0; k < find.length; k++) {
                    int iSrcPos = i + k;
                    if (iSrcPos >= src.length)
                        return -1;
                    if (src[iSrcPos] != find[k])
                        bOK = false;
                } //for k
                if (bOK)
                    return i;
            }
        } //for i

        return -1;
    }
}

Related

1. formatDate(Date src, String formatPattern)
2. formatDate(final Date date, final String pattern)
3. formatDate(final Date date, String pattern)
4. formatDate(final String date)
5. formatDate(java.util.Date date, String pattern)
6. formatDate(Object obj, String format)
7. formatDate(String date)
8. formatDate(String date)
9. formatDate(String dateTimeString)