private static String formatTimestampTz(long ts, String tzStr) {
    TimeZone tz = TIMEZONE_CACHE.get(tzStr);
    return formatTimestampMillis(ts, DateTimeUtils.TIMESTAMP_FORMAT_STRING, tz);
  }
Convert datetime string from a time zone to another time zone.

@param dateStr the date time string
@param tzFrom the original time zone
@param tzTo the target time zone
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/util/DateTimeUtils.java