>>> from snowflake.snowpark.functions import as_timestamp_tz, to_variant
>>> df = session.sql("select TO_TIMESTAMP_TZ('2018-10-10 12:34:56 +0000') as alarm")
>>> df.alarm_v = to_variant(df.alarm)
>>> df.select(df.alarm_v.as_("alarm")).collect() == df.select(df.alarm).collect()
False
>>> df.select(as_timestamp_tz(df.alarm_v).as_("alarm")).collect() == df.select(df.alarm).collect()
True