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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.jackson.ser;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

import java.io.IOException;
import java.time.LocalDateTime;
import java.time.ZoneId;

/**
 * Jackson serializer that converts a {@link java.time.LocalDateTime} into milliseconds since the epoch
 * in the UTC zone by default, or in a zone specified in the constructor.
 */
public class LocalDateTimeEpochTimeSerializer extends StdSerializer {

    private static final ZoneId UTC_ZONE = ZoneId.of("UTC");

    private final ZoneId zoneId;

    /**
     * Create a new instance that serializes in the UTC time zone.
     */
    public LocalDateTimeEpochTimeSerializer() {
        this(UTC_ZONE);
    }

    /**
     * Create a new instance that serializes in the specified time zone.
     *
     * @param zoneId the ID of the time zone
     */
    public LocalDateTimeEpochTimeSerializer(ZoneId zoneId) {
        super(LocalDateTime.class);
        this.zoneId = zoneId;
    }

    @Override
    public void serialize(LocalDateTime value,
                          JsonGenerator jsonGenerator,
                          SerializerProvider provider) throws IOException {

        jsonGenerator.writeNumber(value.atZone(zoneId).toInstant().toEpochMilli());
    }
}