to_unix_timestamp udf result incorrect

//代码占位符
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/local/hive/lib/log4j-slf4j-impl-2.10.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/local/hive/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/local/hadoop-3.2.1/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Hive Session ID = 3a04a9cf-1fdb-4017-a4bb-14763a3163c7Logging initialized using configuration in file:/usr/local/hive/conf/hive-log4j2.properties Async: true
Hive Session ID = 92ca916b-cfde-43b5-bd86-10d50ff7d861
Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases.
hive> select unix_timestamp('2021-09-24 00:00:00');
OK
1632441600
Time taken: 3.729 seconds, Fetched: 1 row(s)

//代码占位符
SessionState ss = SessionState.get(); String timeZoneStr = ss.getConf().get("hive.local.time.zone"); if (timeZoneStr == null || timeZoneStr.trim().isEmpty() || timeZoneStr.toLowerCase().equals("local")) { timeZoneStr = System.getProperty("user.timezone"); } formatter.setTimeZone(TimeZone.getTimeZone(timeZoneStr));