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F_ASCHERMITTWOCH

function from adhoc

Entrypoint aschermittwoch compatible with UTF-8

Inputs/Outputs

   Input      INTEGER     year
   Output     DATE        date of Ash Wednesday of the year

Inputs/Outputs

   TestSQL
   SELECT '21.02.2007' AS ISCORRECT, F_ASCHERMITTWOCH(2007) FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_ASCHERMITTWOCH(NULL) FROM RDB$DATABASE;