F_AGEINMONTHSN

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) months between timestamp 1 and timestamp 2

if you want <null> if the first date is newer than the second date

Example

 SELECT NULL AS ISCORRECT, F_AGEINMONTHSN('12.12.2018', '12.01.2018') FROM RDB$DATABASE;

Expected results:

 ISCORRECT F_AGEINMONTHSN
 ========= ==============
 <null>            <null>

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