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
ANSI SQL DateTime literals differ from other SQL literals in that they are always 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.