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F_FIRSTDAYKW

function from adhoc

Entrypoint firstdaykw compatible with UTF-8

Inputs/Outputs

   Input      TIMESTAMP     date optionally time 
   Output     TIMESTAMP     Date with 1st day of (ISO)week of the year as date with time 00:00:00

Syntax

   TestSQL
   SELECT '27.12.2004' AS ISCORRECT, F_FIRSTDAYKW(53, 2004) FROM RDB$DATABASE;
   SELECT '03.01.2005' AS ISCORRECT, F_FIRSTDAYKW(1, 2005) FROM RDB$DATABASE;
   SELECT '28.04.2008' AS ISCORRECT, F_FIRSTDAYKW(18, 2008) FROM RDB$DATABASE;
   SELECT '23.03.2009' AS ISCORRECT, F_FIRSTDAYKW(13, 2009) FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_FIRSTDAYKW(NULL) FROM RDB$DATABASE;