Java String to Date stringToDate(String input)

Description

string To Date

License

Apache License

Declaration

public static Date stringToDate(String input) 

Method Source Code

//package com.java2s;
/*//from www.j a  v  a 2 s  . c om
 * Licensed to Prodevelop SL under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The Prodevelop SL licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 * For more information, contact:
 *
 *   Prodevelop, S.L.
 *   Pza. Don Juan de Villarrasa, 14 - 5
 *   46001 Valencia
 *   Spain
 *
 *   +34 963 510 612
 *   +34 963 510 968
 *   prode@prodevelop.es
 *   http://www.prodevelop.es
 * 
 * @author Alberto Romeu Carrasco aromeu@prodevelop.es
 */

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Main {
    private static final String[] timeFormats = { "HH:mm:ss", "HH:mm" };
    private static final String[] dateSeparators = { "/", "-", " " };
    private static final String DMY_FORMAT = "dd{sep}MM{sep}yyyy";
    private static final String YMD_FORMAT = "yyyy{sep}MM{sep}dd";
    private static final String ymd_template = "\\d{4}{sep}\\d{2}{sep}\\d{2}.*";
    private static final String dmy_template = "\\d{2}{sep}\\d{2}{sep}\\d{4}.*";

    public static Date stringToDate(String input) {
        Date date = null;
        String dateFormat = getDateFormat(input);
        if (dateFormat == null) {
            throw new IllegalArgumentException("Date is not in an accepted format " + input);
        }

        for (String sep : dateSeparators) {
            String actualDateFormat = patternForSeparator(dateFormat, sep);
            // try first with the time
            for (String time : timeFormats) {
                date = tryParse(input, actualDateFormat + " " + time);
                if (date != null) {
                    return date;
                }
            }
            // didn't work, try without the time formats
            date = tryParse(input, actualDateFormat);
            if (date != null) {
                return date;
            }
        }

        return date;
    }

    private static String getDateFormat(String date) {
        for (String sep : dateSeparators) {
            String ymdPattern = patternForSeparator(ymd_template, sep);
            if (date.matches(ymdPattern)) {
                return YMD_FORMAT;
            }
            String dmyPattern = patternForSeparator(dmy_template, sep);
            if (date.matches(dmyPattern)) {
                return DMY_FORMAT;
            }
        }

        return null;
    }

    private static String patternForSeparator(String template, String sep) {
        return template.replace("{sep}", sep);
    }

    private static Date tryParse(String input, String pattern) {
        try {
            return new SimpleDateFormat(pattern).parse(input);
        } catch (ParseException e) {
            return null;
        }
    }
}

Related

1. stringToDate(String dateText, String format, boolean lenient)
2. StringToDate(String Expression)
3. StringToDate(String fecha)
4. stringToDate(String fecha, String formato)
5. StringToDate(String format, String dateStr)
6. stringToDate(String pstrValue, String pstrDateFormat)
7. stringToDate(String s)
8. StringToDate(String s)
9. stringToDate(String s)