F_AGEINDAYS

substitutable with DATEADD

compatibility to FreeUDFLib, FreeUDFLib AvERP
input/output-compatibility to rFunc (DAYSBETWEEN)
Compatible with UTF-8
Input TIMESTAMP (older) date optionally time 1, TIMESTAMP (newer) date optionally time 2
difference in (integer) days between timestamp 1 and timestamp 2

if you want a negative number if the first date is newer than the second date

Example

 SELECT 10 AS ISCORRECT, F_AGEINDAYS('01.10.2018 15:01:03','11.10.2018 15:04:03') FROM RDB$DATABASE;

Expected results:

    ISCORRECT  F_AGEINDAYS
 ============ ============
           10           10

Example

 SELECT -20 AS ISCORRECT, F_AGEINDAYS('01.10.2018 15:01:03','11.09.2018 15:04:03') FROM RDB$DATABASE;

Expected results:

    ISCORRECT  F_AGEINDAYS
 ============ ============
          -20          -20

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