jooby/src/main/java/org/jooby/RequestLogger.java
public RequestLogger dateFormatter(final DateTimeFormatter formatter) {
    requireNonNull(formatter, "Formatter required.");
    return dateFormatter(ts -> formatter.format(Instant.ofEpochMilli(ts)));
  }
public RequestLogger dateFormatter(final DateTimeFormatter formatter) {
    requireNonNull(formatter, "Formatter required.");
    return dateFormatter(ts -> formatter.format(Instant.ofEpochMilli(ts)));
  }
Override the default date formatter.

@param formatter New formatter to use.
@return This instance.