code: public static Date asDate(JsonNode node, String dateTimeFormat) {
          return node != null ? ValueUtils.convertDate(node, dateTimeFormat) : null;
      }
docs: Extract value from a {@link JsonNode} as a date. If the extracted value is string, parse it
  as {@link Date} using the specified date-time format.
  
  @param node
  @param dateTimeFormat
  @return
  @since 0.6.3.3