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F_FIRSTDAYWEEKISO

function from adhoc

Entrypoint firstdayweekiso compatible with UTF-8

Inputs/Outputs

   Input      TIMESTAMP     date optionally time 
   Output     TIMESTAMP     Date with 1st day of (ISO)weekday (Monday) as date with time 00:00:00

Syntax

   TestSQL
   SELECT '22.12.2008' AS ISCORRECT, F_FIRSTDAYWEEKISO('26.12.2008 15:00:00') FROM RDB$DATABASE;
   SELECT '29.12.2008' AS ISCORRECT, F_FIRSTDAYWEEKISO('03.01.2009 15:00:00') FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_FIRSTDAYWEEKISO(NULL) FROM RDB$DATABASE;