F_AGEINYEARS

substitutable with DATEDIFF

function from adhoc
Compatible with UTF-8
Input TIMESTAMP (older) date optionally time 1, TIMESTAMP (newer) date optionally time 2
Output INTEGER difference in (integer) years between timestamp 1 and timestamp 2

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

Example

 SELECT 4 AS ISCORRECT, F_AGEINYEARS('12.12.2014', '17.12.2018') FROM RDB$DATABASE;

Expected results:

    ISCORRECT F_AGEINYEARS
 ============ ============
            4            4

Example

 SELECT -5 AS ISCORRECT, F_AGEINYEARS('12.12.2018', '12.12.2013') FROM RDB$DATABASE;

Expected results:

    ISCORRECT F_AGEINYEARS
 ============ ============
           -5           -5

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