The timestamp expression to be converted.
- One of the following data attributes:
- AT LOCAL
Use the time zone displacement based on the current session time zone.
- AT SOURCE [TIME ZONE]
Use the time zone associated with timestamp_expression when:
- AT SOURCE TIME ZONE is specified.
- AT SOURCE is specified without TIME ZONE and there is no column named source in the scope.
Otherwise, if AT SOURCE is specified without TIME ZONE and a column named source exists, then SOURCE references this column, and the value of the column is used as the time zone displacement for the CAST. If needed, the column value is implicitly converted to type INTERVAL HOUR(2) TO MINUTE.
- AT [TIME ZONE] expression
Use the time zone displacement defined by expression.
The data type of expression should be INTERVAL HOUR(2) TO MINUTE or it must be a data type that can be implicitly converted to INTERVAL HOUR(2) TO MINUTE.
- AT [TIME ZONE] time_zone_string
- time_zone_string determines the time zone displacement.