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Table 9-26 shows the available functions for date/time value processing, with details appearing in the following subsections. Table 9-25 illustrates the behaviors of the basic arithmetic operators (+, *, etc.). For formatting functions, refer to Section 9.7. You should be familiar with the background information on date/time data types from Section 8.5.
All the functions and operators described below that take time or timestamp inputs actually come in two variants: one that takes time with time zone or timestamp with time zone, and one that takes time without time zone or timestamp without time zone. For brevity, these variants are not shown separately.
Table 9-25. Date/Time Operators
| Operator | Example | Result |
|---|---|---|
| + | date '2001-09-28' + integer '7' | date '2001-10-05' |
| + | date '2001-09-28' + interval '1 hour' | timestamp '2001-09-28 01:00' |
| + | date '2001-09-28' + time '03:00' | timestamp '2001-09-28 03:00' |
| + | time '03:00' + date '2001-09-28' | timestamp '2001-09-28 03:00' |
| + | interval '1 day' + interval '1 hour' | interval '1 day 01:00' |
| + | timestamp '2001-09-28 01:00' + interval '23 hours' | timestamp '2001-09-29 00:00' |
| + | time '01:00' + interval '3 hours' | time '04:00' |
| + | interval '3 hours' + time '01:00' | time '04:00' |
| - | - interval '23 hours' | interval '-23:00' |
| - | date '2001-10-01' - date '2001-09-28' | integer '3' |
| - | date '2001-10-01' - integer '7' | date '2001-09-24' |
| - | date '2001-09-28' - interval '1 hour' | timestamp '2001-09-27 23:00' |
| - | time '05:00' - time '03:00' | interval '02:00' |
| - | time '05:00' - interval '2 hours' | time '03:00' |
| - | timestamp '2001-09-28 23:00' - interval '23 hours' | timestamp '2001-09-28 00:00' |
| - | interval '1 day' - interval '1 hour' | interval '23:00' |
| - | interval '2 hours' - time '05:00' | time '03:00' |
| - | timestamp '2001-09-29 03:00' - timestamp '2001-09-27 12:00' | interval '1 day 15:00' |
| * | double precision '3.5' * interval '1 hour' | interval '03:30' |
| * | interval '1 hour' * double precision '3.5' | interval '03:30' |
| / | interval '1 hour' / double precision '1.5' | interval '00:40' |