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Java library for interacting with the Digipost REST API

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/*
 * Copyright (C) Posten Norge AS
 *
 * 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.
 */
package no.digipost.api.client.util;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class DateUtils {

    public static final String RFC_1123_DATE_FORMAT = "EEE, dd MMM yyyy HH:mm:ss 'GMT'";
    private static final DateTimeFormatter fmt = DateTimeFormatter.ofPattern(RFC_1123_DATE_FORMAT).withZone(ZoneId.of("GMT")).withLocale(Locale.ENGLISH);

    /**
     * Returns an RFC 1123 date format used in HTTP
     */
    public static String formatDate(ZonedDateTime dateTime) {
        return dateTime.format(fmt);
    }

    /**
     * Return a {@link ZonedDateTime} parsed from an RFC 1123 compliant string
     */
    public static ZonedDateTime parseDate(String dateTime) {
        return ZonedDateTime.parse(dateTime, fmt);
    }

}