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Oracle® Database SQL Language Reference
11g Release 1 (11.1)

B28286-07
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Datetime Expressions

A datetime expression yields a value of one of the datetime datatypes.

datetime_expression::=

Description of datetime_expression.gif follows
Description of the illustration datetime_expression.gif

The initial expr is any expression, except a scalar subquery expression, that evaluates to a value of datatype TIMESTAMP, TIMESTAMP WITH TIME ZONE, or TIMESTAMP WITH LOCAL TIME ZONE. The DATE datatype is not supported. If this expr is itself a datetime_expression, then it must be enclosed in parentheses.

Datetimes and intervals can be combined according to the rules defined in Table 2-5. The three combinations that yield datetime values are valid in a datetime expression.

If you specify AT LOCAL, then Oracle uses the current session time zone.

The settings for AT TIME ZONE are interpreted as follows:

See Also:

Example The following example converts the datetime value of one time zone to another time zone:

SELECT FROM_TZ(CAST(TO_DATE('1999-12-01 11:00:00', 
      'YYYY-MM-DD HH:MI:SS') AS TIMESTAMP), 'America/New_York') 
   AT TIME ZONE 'America/Los_Angeles' "West Coast Time" 
   FROM DUAL;

West Coast Time
------------------------------------------------
01-DEC-99 08.00.00.000000 AM AMERICA/LOS_ANGELES