The Art of PostgreSQL/

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Time Intervals

Time Intervals

Learn about time interval styles and implement a calendar using PostgreSQL.

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The interval data type

PostgreSQL implements an interval data type along with the time, date, and timestamptz data types. An interval describes a duration, such as a month, two weeks, or even a millisecond:

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set intervalstyle to postgres;
select interval '1 month',
       interval '2 weeks',
       2 * interval '1 week',
       78389 * interval '1 ms';

The default PostgreSQL output looks like this:

 interval │ interval │ ?column? │   ?column?
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