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Clarification of UNIX_TIMESTAMP() limited range checking.

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arjen@fred.bitbike.com 2002-05-21 10:04:34 +10:00
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Docs/manual.texi
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@ -32499,8 +32499,9 @@ mysql> SELECT UNIX_TIMESTAMP('1997-10-04 22:23:00');
When @code{UNIX_TIMESTAMP} is used on a @code{TIMESTAMP} column, the function
will return the internal timestamp value directly, with no implicit
``string-to-unix-timestamp'' conversion.
If you give @code{UNIX_TIMESTAMP()} a wrong or out-of-range date, it will
return 0.
If you pass an out-of-range date to @code{UNIX_TIMESTAMP()} it will
return 0, but please note that only basic checking is performed
(year 1970-2037, month 01-12, day 01-31).
If you want to subtract @code{UNIX_TIMESTAMP()} columns, you may want to
cast the result to signed integers. @xref{Cast Functions}.