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F_FIRSTDAYWEEK

function from adhoc

Entrypoint firstdayweek compatible with UTF-8

Inputs/Outputs

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

Syntax

   TestSQL
   SELECT '21.12.2008' AS ISCORRECT, F_FIRSTDAYWEEK('26.12.2008 15:00:00') FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_FIRSTDAYWEEK(NULL) FROM RDB$DATABASE;