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F_GRUENDONNERSTAG

function from adhoc

Entrypoint gruendonnerstag compatible with UTF-8

Inputs/Outputs

   Input      INTEGER     year
   Output     DATE        date of Holy Thursday of the year

Syntax

   TestSQL
   SELECT '05.04.2007' AS ISCORRECT, F_GRUENDONNERSTAG(2007) FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_GRUENDONNERSTAG(NULL) FROM RDB$DATABASE;