Java Date UTC Parse getLocalTimeFromUTC( String localTimeZoneId, java.util.Date utcTimestamp)

Description

getLocal: returns the local time.

License

Apache License

Declaration

public static java.util.Date getLocalTimeFromUTC(
        String localTimeZoneId, java.util.Date utcTimestamp) 

Method Source Code

//package com.java2s;
/**/*from w w w .ja  v  a2s. c  o m*/
 * Copyright 2015 Jan Lolling jan.lolling@gmail.com
 * 
 * Licensed 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.
 */

public class Main {
    private static java.util.TimeZone utcTimeZone = null;

    /**
     * getLocal: returns the local time.
     * 
     * {talendTypes} Date
     * 
     * {Category} TimestampUtil
     * 
     * {param} string("Europe/Madrid") localTimeZoneId : ID of time zone
     * 
     * {param} date(utcTimestamp) utcTimestamp : the date value
     * 
     * {example} getLocalTimeFromUTC("Europe/Madrid", utcTimestamp).
     */
    public static java.util.Date getLocalTimeFromUTC(
            String localTimeZoneId, java.util.Date utcTimestamp) {
        java.util.TimeZone tz = getTimeZone(localTimeZoneId);
        return getLocalTimeFromUTC(tz, utcTimestamp);
    }

    private static java.util.Date getLocalTimeFromUTC(
            java.util.TimeZone tz, java.util.Date utcTimestamp) {
        return getLocalTime(tz, utcTimestamp, getUTCTimeZone());
    }

    private static java.util.TimeZone getTimeZone(String idParam) {
        if (idParam == null || idParam.isEmpty()) {
            throw new IllegalArgumentException(
                    "id for time zone cannot be null or empty");
        }
        idParam = idParam.trim();
        String[] tzArray = java.util.TimeZone.getAvailableIDs();
        for (String id : tzArray) {
            if (id.equalsIgnoreCase(idParam)) {
                return java.util.TimeZone.getTimeZone(id);
            }
        }
        return null;
    }

    private static java.util.Date getLocalTime(
            java.util.TimeZone localTimeZone, java.util.Date timestamp,
            java.util.TimeZone sourceTimeZone) {
        if (timestamp != null) {
            if (localTimeZone == null) {
                throw new IllegalArgumentException(
                        "localTimeZone cannot be null");
            }
            if (sourceTimeZone == null) {
                throw new IllegalArgumentException(
                        "sourceTimeZone cannot be null");
            }
            java.util.Calendar c = java.util.Calendar.getInstance();
            //c.setTimeZone(sourceTimeZone);
            c.clear();
            c.setTimeInMillis(timestamp.getTime());
            // adapt the local time zone
            int offset = localTimeZone.getOffset(timestamp.getTime());
            offset = offset - sourceTimeZone.getOffset(timestamp.getTime());
            int offsetHrs = offset / 1000 / 60 / 60;
            int offsetMins = offset / 1000 / 60 % 60;
            c.add(java.util.Calendar.HOUR_OF_DAY, (offsetHrs));
            c.add(java.util.Calendar.MINUTE, (offsetMins));
            return c.getTime();
        } else {
            return null;
        }
    }

    private static java.util.TimeZone getUTCTimeZone() {
        if (utcTimeZone == null) {
            utcTimeZone = java.util.TimeZone.getTimeZone("UTC");
        }
        return utcTimeZone;
    }
}

Related

1. getDateTimeUTC(int year, int month, int day, int hour, int minute, int second)
2. getUTC(java.util.Date siteTimestamp)
3. getUTCDate()
4. getUTCDate()
5. getUTCDate()