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select '06:00:00'::TIME - ('19:00:00'::TIME - '07:00:23.388471'::TIME);
+-----------------+
| ?column?        |
|-----------------|
| 18:00:23.388471 |
+-----------------+
SELECT 1
Time: 0.012s

Why isn't it returning a negative result? I'm using the latest version of PostgreSQL.

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  • Yo u are substracting from a time value ('06:00:00') an interval (the result of ('19:00:00'::TIME - '07:00:23.388471'::TIME)). The result of time - interval is a time value. And time values are only between '00:00:00' and '24:00:00'
    – ypercubeᵀᴹ
    Commented Apr 1, 2022 at 23:51
  • Try for example: select '06:00:00'::TIME, '06:00:00'::TIME + interval '24 hour', '06:00:00'::TIME - interval '24 hour' ;. You'll get three identical values.
    – ypercubeᵀᴹ
    Commented Apr 1, 2022 at 23:52

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