F_AGEINHOURS

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) hours between timestamp 1 and timestamp 2

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

Example

 SELECT 3 AS ISCORRECT, F_AGEINHOURS('01.10.2018 15:01:03','01.10.2018 18:01:03') FROM RDB$DATABASE;

Expected results:

    ISCORRECT F_AGEINHOURS
 ============ ============
            3            3

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