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F_ADDWEEK

function from adhoc

Entrypoint addweek compatible with UTF-8

Inputs/Outputs

   Input      TIMESTAMP     date optionally time
              INTEGER       weeks to add
   Output     TIMESTAMP     adds weeks to timestamp

Syntax

   If parameter 2 is negative, weeks where subtract.
   TestSQL
   SELECT '22.10.2005 15:03:01' AS ISCORRECT, F_ADDWEEK('01.10.2005 15:03:01', 3) FROM RDB$DATABASE;
   SELECT '10.09.2005 15:03:01' AS ISCORRECT, F_ADDWEEK('01.10.2005 15:03:01', -3) FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_ADDWEEK(NULL, NULL) FROM RDB$DATABASE;