Java Date String Format formatISODate(String date)

Description

Method to format an inputed date to the iso format of either yyyy, yyyy-mm, or yyyy-mm-dd

License

Open Source License

Parameter

Parameter	Description
date	The input date to format

Return

The formated iso date

Declaration

public static String formatISODate(String date) 

Method Source Code

//package com.java2s;
/**// ww  w  . j ava 2 s .  c o m
 * Archivists' Toolkit(TM) Copyright 2005-2007 Regents of the University of California, New York University, & Five Colleges, Inc.
 * All rights reserved.
 *
 * This software is free. You can redistribute it and / or modify it under the terms of the Educational Community License (ECL)
 * version 1.0 (http://www.opensource.org/licenses/ecl1.php)
 *
 * This software 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 ECL license for more details about permissions and limitations.
 *
 *
 * Archivists' Toolkit(TM)
 * http://www.archiviststoolkit.org
 * info@archiviststoolkit.org
 *
 *
 * Simple utility class for checking that an entered date is valid for the given database
 * and for handeling iso dates in the AT
 *
 * Created by IntelliJ IDEA.
 * User: Nathan Stevens
 * Date: Aug 28, 2008
 * Time: 10:46:58 AM
 * To change this template use File | Settings | File Templates.
 */

public class Main {
    /**
     * Method to format an inputed date to the iso format of either
     * yyyy, yyyy-mm, or yyyy-mm-dd
     * @param date The input date to format
     * @return The formated iso date
     */
    public static String formatISODate(String date) {
        if (date.matches("\\d{1,4}")) { // matches yyyy
            return padYear(date);
        } else if (date.matches("\\d{1,4}-\\d{1,2}")) { // matches yyyy-mm format
            String[] sa = date.split("-");
            return padYear(sa[0]) + "-" + padMonthOrDay(sa[1]);
        } else if (date.matches("\\d{1,4}-\\d{1,2}-\\d{1,2}")) {// matches yyyy-mm-dd
            String[] sa = date.split("-");
            return padYear(sa[0]) + "-" + padMonthOrDay(sa[1]) + "-"
                    + padMonthOrDay(sa[2]);
        } else { // return blank
            return "";
        }
    }

    /**
     * Method to pad the given year with leading zero
     * @param year The year that is pasted in
     * @return The year paded with zero or an empty string if not a valid year
     */
    public static String padYear(String year) {
        // fisrt check to see if it is a year that needs to be padded
        if (year.matches("\\d{4}")) {
            return year;
        } else if (year.matches("\\d{3}")) {
            return "0" + year;
        } else if (year.matches("\\d{2}")) {
            return "00" + year;
        } else if (year.matches("\\d{1}")) {
            return "000" + year;
        } else { // just return the year
            return ""; // year was not good
        }
    }

    /**
     * Pad the month or day with a leading zero
     * @param mod The month or day to pad
     * @return The padded month or day or a blank string if not a valid day or year
     */
    public static String padMonthOrDay(String mod) {
        // fisrt check to see if it is a year that needs to be padded
        if (mod.matches("\\d{2}")) {
            return mod;
        } else if (mod.matches("\\d")) {
            return "0" + mod;
        } else { // month or day format not right return blank
            return "";
        }
    }
}

Related

1. FormatDateString(String dateString)
2. formatDateToParse(String date, String errorMessage)
3. formatDay(String date)
4. formate8Date(String str)
5. formatIso8601ToSimpleDate(String iso8601)
6. formatMinDateForShowWith_(String str)
7. formatQuery(String queryDate)
8. formatShort(String strDate)
9. formatShow(String queryDate)