001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.util.time;
018
019import java.time.Instant;
020import java.time.ZoneOffset;
021import java.time.format.DateTimeFormatter;
022import java.util.Locale;
023
024/**
025 * Utility class for {@link Instant}
026 */
027public class Instants
028{
029
030        public static final DateTimeFormatter RFC_7231_DATE_FORMATTER = DateTimeFormatter
031                .ofPattern("EEE, dd MMM yyyy HH:mm:ss O", Locale.ENGLISH).withZone(ZoneOffset.UTC);
032
033        /**
034         * Formats a given {@link Instant} as required by RFC7231 for dates.
035         * 
036         * @param instant
037         * @return the instant properly formatted
038         */
039        public static String toRFC7231Format(final Instant instant)
040        {
041                return RFC_7231_DATE_FORMATTER.format(instant);
042        }
043}