Java Date Convert convertToDate(String source)

Description

Converts a given string into a date.

License

Apache License

Parameter

Parameter	Description
source	a parameter

Return

Returns Date.

Declaration

public static Date convertToDate(String source) 

Method Source Code

//package com.java2s;
/*/*  www .  j a v a2 s .  c  o m*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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.
 */

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import java.util.TimeZone;

public class Main {
    /**
     * Converts a given string into a date. Code from Axis1 DateDeserializer.
     *
     * @param source
     * @return Returns Date.
     */
    public static Date convertToDate(String source) {

        // the lexical form of the date is '-'? yyyy '-' mm '-' dd zzzzzz?
        if ((source == null) || source.trim().equals("")) {
            return null;
        }
        source = source.trim();
        boolean bc = false;
        if (source.startsWith("-")) {
            source = source.substring(1);
            bc = true;
        }

        int year = 0;
        int month = 0;
        int day = 0;
        int timeZoneOffSet = TimeZone.getDefault().getRawOffset();

        if (source.length() >= 10) {
            //first 10 numbers must give the year
            if ((source.charAt(4) != '-') || (source.charAt(7) != '-')) {
                throw new RuntimeException("invalid date format (" + source + ") with out - s at correct place ");
            }
            year = Integer.parseInt(source.substring(0, 4));
            month = Integer.parseInt(source.substring(5, 7));
            day = Integer.parseInt(source.substring(8, 10));

            if (source.length() > 10) {
                String restpart = source.substring(10);
                if (restpart.startsWith("Z")) {
                    // this is a gmt time zone value
                    timeZoneOffSet = 0;
                } else if (restpart.startsWith("+") || restpart.startsWith("-") || restpart.startsWith("T")) {
                    // this is a specific time format string
                    if (restpart.charAt(3) != ':') {
                        throw new RuntimeException(
                                "invalid time zone format (" + source + ") without : at correct place");
                    }
                    int hours = Integer.parseInt(restpart.substring(1, 3));
                    int minits = Integer.parseInt(restpart.substring(4, 6));
                    timeZoneOffSet = ((hours * 60) + minits) * 60000;
                    if (restpart.startsWith("-")) {
                        timeZoneOffSet = timeZoneOffSet * -1;
                    }
                } else {
                    throw new RuntimeException("In valid string sufix");
                }
            }
        } else {
            throw new RuntimeException("In valid string to parse");
        }

        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setLenient(false);
        calendar.set(Calendar.YEAR, year);
        //xml month stars from the 1 and calendar month is starts with 0
        calendar.set(Calendar.MONTH, month - 1);
        calendar.set(Calendar.DAY_OF_MONTH, day);
        calendar.set(Calendar.ZONE_OFFSET, timeZoneOffSet);

        // set the day light off set only if time zone
        if (source.length() >= 10) {
            calendar.set(Calendar.DST_OFFSET, 0);
        }
        calendar.getTimeInMillis();
        if (bc) {
            calendar.set(Calendar.ERA, GregorianCalendar.BC);
        }

        return calendar.getTime();

    }
}

Related

1. convertSistemDependentDateToDesiredTimeZone(final Date sistemDependentDate, TimeZone desiredTimeZone)
2. convertStringToDate(String date)
3. convertStringToDate(String date)
4. convertStringToDate(String string)
5. convertToClientTime(Date serverDate, Integer clientTimezoneOffset)
6. convertToDateStamp(long time)
7. convertToDateTime(String source)
8. convertToStartOfDay(Date date)
9. convertTweetDateToLong(String date)