An error is returned for the following SELECT statements because the source expression does not have a time zone.
SELECT CAST(TIME '08:30:00' AS TIMESTAMP(0) AT SOURCE TIME ZONE); SELECT CAST(TIME '08:30:00' AS TIMESTAMP(0) AT SOURCE); SELECT CAST(TIME '08:30:00' AS TIMESTAMP(0) WITH TIME ZONE AT SOURCE TIME ZONE); SELECT CAST(TIME '08:30:00' AS TIMESTAMP(0) WITH TIME ZONE AT SOURCE);