title: Convert Long to LocalDateTime
body: <p>I receive this error when trying to get response from Api Call:</p>
  <p>I receive this field like this from the object:</p>
  <pre><code>&quot;createdAt&quot;:1620133356550
  </code></pre>
  <p>My Dto has this field, so i can get the value with object mapper:</p>
  <pre><code>@JsonSerialize(using = LocalDateTimeSerializer.class)
    private LocalDateTime createdAt;
  </code></pre>
  <p>And i receive this error:</p>
  <pre><code>com.fasterxml.jackson.databind.exc.MismatchedInputException: raw timestamp (1620133356550) not allowed for `java.time.LocalDateTime`: need additional information such as an offset or time-zone (see class Javadocs)
  </code></pre>
  <p>Possible setter of the object:</p>
  <pre><code> public void setCreatedAt(long createdAt) {
          Instant instant = Instant.ofEpochMilli(createdAt);
  LocalDateTime localMark =
    instant.atZone(ZoneId.of(&quot;Europe/Amsterdam&quot;))
    .toLocalDateTime();
      this.createdAt = localMark;
    }
  </code></pre>