PostgreSQL DATE_PART() function

DATE_PART() function

The PostgreSQL DATE_PART() function is used to extract a specific part of a date and time value, such as the year, month, day, hour, minute, second, etc.

Uses of DATE_PART() Function

• Extract Year: Retrieve the year part from a timestamp or date.


• Extract Month: Retrieve the month part from a timestamp, date, or interval.


• Extract Day: Retrieve the day part from a timestamp or date.


• Extract Hour: Retrieve the hour part from a timestamp.


• Extract Minute: Retrieve the minute part from a timestamp.


• Extract Second: Retrieve the second part from a timestamp.


• Extract Part from Interval: Retrieve specific parts from an interval, such as years, months, days, etc.

Syntax:

date_part(text, timestamp)
or
date_part(text, interval)

Return Type: double precision.

PostgreSQL Version: 9.3

Pictorial Presentation of PostgreSQL DATE_PART() function

Example 1: PostgreSQL DATE_PART() function

The example below finds the hour part from the timestamp (date and time specified in the argument) .

code:

SELECT date_part('hour', timestamp '2002-09-17 19:27:45');

Sample Output:

 date_part
-----------
        19
(1 row)

Example 2: PostgreSQL DATE_PART() function

The example below extracts the months part the given age.

Code:

SELECT date_part('month', interval '3 years 7 months');

Sample Output:

 date_part
-----------
         7
(1 row)

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