F_AGEINHOURSTHRESHOLDN

function from adhoc
Compatible with UTF-8
Input TIMESTAMP (older) date optionally time 1, TIMESTAMP (newer) date optionally time 2, INTEGER min. value, INTEGER min. value is used (0 = no, 1 = yes), INTEGER max. value, INTEGER max. value is used (0 = no, 1 = yes)
Output INTEGER difference in (integer) hours between timestamp 1 and timestamp 2

Example

 select null as ISCORRECT, F_AGEINHOURSTHRESHOLDN('02.10.2018 18:01:03', '01.10.2018 15:01:03', 5, 1, 10, 1)
 from RDB$DATABASE;

Expected results:

 ISCORRECT F_AGEINHOURSTHRESHOLDN
 ========= ======================
 <null>                    <null>

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