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F_WORKINGDAYSBETWEEN

function from adhoc

Entrypoint workingdaysbetween compatible with UTF-8

Inputs/Outputs

   Input     TIMESTAMP     date optionally time 1
             TIMESTAMP     date optionally time 2
             INTEGER       weekday don't calculate
   Output    INTEGER       difference in (integer) days between timestamp 1 and timestamp 2 less of weekday/s from param 3

Syntax

   weekday: Monday = 1, Tuesday = 2, Wednesday = 3, Thursday = 4, Friday = 5, Saturday = 6, Sunday = 7
   The result is always positive.
   Any order of indexes for weekdays. Only allowed indexes are calculated.
   Test SQL
   SELECT 4 AS ISCORRECT, F_WORKINGDAYSBETWEEN('12.12.2008', '17.12.2008', 7) FROM RDB$DATABASE;
   SELECT 4 AS ISCORRECT, F_WORKINGDAYSBETWEEN('17.12.2008', '12.12.2008', 7) FROM RDB$DATABASE;
   SELECT -4 AS ISCORRECT, F_AGEINWORKINGDAYS('17.12.2008', '12.12.2008', 7) FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_WORKINGDAYSBETWEEN(NULL, NULL, NULL) FROM RDB$DATABASE;