date_part

The date_part function is modeled on the traditional Ingres equivalent to the SQL-standard function extract:

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date_part('field', source)

Note that the field must be a string, rather than a name. The valid field names are the same as those for extract. For details, see EXTRACT.

Example:

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SELECT date_part('day', TIMESTAMP '2001-02-16 20:38:40');
 date_part 
-----------
        16
(1 row)

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SELECT date_part('hour', interval '4 hours 3 minutes');
 date_part 
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         4
(1 row)