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DATE function
The DATE function returns a date from a value.
The argument must be a date, timestamp, a positive number less
than or equal to 2,932,897, a valid string representation of a date or timestamp,
or a string of length 7 that is not a CLOB, LONG VARCHAR, or XML value. If
the argument is a string of length 7, it must represent a valid date in the
form yyyynnn, where yyyy are digits denoting a year, and nnn are digits between
001 and 366, denoting a day of that year. The result of the function is a
date. If the argument can be null, the result can be null; if the argument
is null, the result is the null value.
The other rules depend on the
data type of the argument specified:
- If the argument is a date, timestamp, or valid string representation of
a date or timestamp: The result is the date part of the value.
- If the argument is a number: The result is the date that is n-1 days after
January 1, 1970, where n is the integral part of the number.
- If the argument is a string with a length of 7: The result is the date
represented by the string.
Syntax DATE ( expression )
This example results in an internal representation of '1988-12-25'.
VALUES DATE('1988-12-25')
This example results in an internal representation of '1972-02-28'.
VALUES DATE(789)
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