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https://issues.apache.org/jira/browse/SPARK-22395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240396#comment-16240396
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Apache Spark commented on SPARK-22395:
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User 'HyukjinKwon' has created a pull request for this issue:
https://github.com/apache/spark/pull/19674
> Fix the behavior of timestamp values for Pandas to respect session timezone
> ---------------------------------------------------------------------------
>
> Key: SPARK-22395
> URL: https://issues.apache.org/jira/browse/SPARK-22395
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 2.3.0
> Reporter: Takuya Ueshin
>
> When converting Pandas DataFrame/Series from/to Spark DataFrame using
> {{toPandas()}} or pandas udfs, timestamp values behave to respect Python
> system timezone instead of session timezone.
> For example, let's say we use {{"America/Los_Angeles"}} as session timezone
> and have a timestamp value {{"1970-01-01 00:00:01"}} in the timezone. Btw,
> I'm in Japan so Python timezone would be {{"Asia/Tokyo"}}.
> The timestamp value from current {{toPandas()}} will be the following:
> {noformat}
> >>> spark.conf.set("spark.sql.session.timeZone", "America/Los_Angeles")
> >>> df = spark.createDataFrame([28801], "long").selectExpr("timestamp(value)
> >>> as ts")
> >>> df.show()
> +-------------------+
> | ts|
> +-------------------+
> |1970-01-01 00:00:01|
> +-------------------+
> >>> df.toPandas()
> ts
> 0 1970-01-01 17:00:01
> {noformat}
> As you can see, the value becomes {{"1970-01-01 17:00:01"}} because it
> respects Python timezone.
> As we discussed in https://github.com/apache/spark/pull/18664, we consider
> this behavior is a bug and the value should be {{"1970-01-01 00:00:01"}}.
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