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A Java SDK to help implementing the Open Banking standard : https://www.openbanking.org.uk/read-write-apis/

There is a newer version: 3.1.2.5

/**
 *
 * The contents of this file are subject to the terms of the Common Development and
 *  Distribution License (the License). You may not use this file except in compliance with the
 *  License.
 *
 *  You can obtain a copy of the License at https://forgerock.org/cddlv1-0/. See the License for the
 *  specific language governing permission and limitations under the License.
 *
 *  When distributing Covered Software, include this CDDL Header Notice in each file and include
 *  the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 *  Header, with the fields enclosed by brackets [] replaced by your own identifying
 *  information: "Portions copyright [year] [name of copyright owner]".
 *
 *  Copyright 2019 ForgeRock AS.
 */
package uk.org.openbanking.jackson;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import java.io.IOException;

public class DateTimeSerializer extends StdSerializer {

    public static final DateTimeFormatter DATE_TIME_FORMATTER =
            DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ssZZ");

    public DateTimeSerializer() {
        this(null);
    }

    public DateTimeSerializer(Class t) {
        super(t);
    }

    @Override
    public void serialize(DateTime dateTime, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
            throws IOException {
        jsonGenerator.writeObject(DATE_TIME_FORMATTER.print(dateTime));
    }
}