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F_ADDMINUTE

substitutable with DATEADD

• function from adhoc
• Compatible with UTF-8
• Input TIMESTAMP date optionally time, INTEGER minutes to add
• Output TIMESTAMP adds minutes to timestamp

If parameter 2 is negative, minutes to subtract.

Example

 select cast('01.10.2018 15:06:01' as timestamp) as ISCORRECT, F_ADDMINUTE('01.10.2018 15:03:01', 3)
 from RDB$DATABASE
 union
 select cast('01.10.2018 15:00:01' as timestamp) as ISCORRECT, F_ADDMINUTE('01.10.2018 15:03:01', -3)
 from RDB$DATABASE
 union
 select null as ISCORRECT, F_ADDMINUTE(null, null)
 from RDB$DATABASE;

Expected results:

                 ISCORRECT
 ========================= =========================
                    <null>                    <null>
 2018-10-01 15:00:01.0000  2018-10-01 15:00:01.0000
 2018-10-01 15:06:01.0000  2018-10-01 15:06:01.0000

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