The ANSI SQL DateTime literals provide DateTime values in source text, supporting a means for declaring values for DATE, TIME, and TIMESTAMP data types.
Keywords for ANSI DateTime Literals
Unlike other SQL literals, ANSI SQL DateTime literals are prefaced by a keyword or keywords.
Here is an example showing the TIMESTAMP keyword prefacing a timestamp literal:
TIMESTAMP '1999-07-01 15:00:00-08:00'
Literals expressed in this format are interpreted exclusively as ANSI DateTime values.