Java Hour Format format(Date date)

Description

format

License

Open Source License

Declaration

public static String format(Date date) 

Method Source Code

//package com.java2s;
/*//from   w  w w .  j a v  a2 s.  c o m
 * Copyright 2013-2015 EMC Corporation. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 * http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 * or in the "license" file accompanying this file. This file 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.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import java.util.WeakHashMap;

public class Main {
    private static final String ISO_8601_DATE_Z = "yyyy-MM-dd'T'HH:mm:ss'Z'";
    private static final ThreadLocal<WeakHashMap<String, DateFormat>> formatCache = new ThreadLocal<>();

    public static String format(Date date) {
        if (date == null)
            return null;
        return getFormat(ISO_8601_DATE_Z).format(date);
    }

    private static DateFormat getFormat(String formatString) {
        if (formatCache.get() == null) {
            formatCache.set(new WeakHashMap<String, DateFormat>());
        }

        DateFormat format = formatCache.get().get(formatString);
        if (format == null) {
            format = new SimpleDateFormat(formatString);
            format.setTimeZone(TimeZone.getTimeZone("UTC"));
            formatCache.get().put(formatString, format);
        }
        return format;
    }
}

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