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SQL Anywhere 10.0.1 » SQL Anywhere Server - SQL Reference » SQL Data Types » Data type conversions

Converting NULL constants to NUMERIC and string types Next Page

Converting dates to strings

SQL Anywhere provides several functions for converting SQL Anywhere date and time values into a wide variety of strings and other expressions. It is possible in converting a date value into a string to reduce the year portion into a two-digit number representing the year, thereby losing the century portion of the date.

Wrong century values

Consider the following statement, which incorrectly converts a string representing the date January 1, 2000 into a string representing the date January 1, 1900 even though no database error occurs.

            DATEFORMAT('2000-01-01', 'Mmm dd/yy' ),
            'yyyy-Mmm-dd' )
    AS Wrong_year;

SQL Anywhere automatically and correctly converts the unambiguous date string 2000-01-01 into a date value. However, the 'Mmm dd/yy' formatting of the inner, or nested, DATEFORMAT function drops the century portion of the date when it is converted back to a string and passed to the outer DATEFORMAT function.

Because the database option nearest_century in this case is set to 0, the outer DATEFORMAT function converts the string representing a date with a two-digit year value into a year between 1900 and 1999.

For more information on date and time functions, see Date and time functions.