Extract hour from datetime (timestamp) in PostgreSQL

To extract hour from datetime i.e. timestamp in PostgreSQL, you can use the DATE_PART() function with the ‘hour’ unit.

Syntax for DATE_PART() Function in PostgreSQL:

unit: Specifies the part of the date or timestamp to extract (e.g., ‘year’, ‘month’, ‘day’, ‘hour’, ‘minute’, ‘second’, etc.).

source: The date or timestamp from which to extract the specified part.

In Our case. The values of the unit must be “hour”

Extract hour from datetime(timestamp) in postgresql Simple Example:

In order to Extract hour from datetime (timestamp) in postgresql we will be using DATE_PART() function.

In the below Example we will be passing hour as “unit” argument and datetime as “source” argument in order to extract hour from Date or datetime

 

SELECT DATE_PART('hour', '2024-02-24 15:30:45.123456'::timestamp) AS hour_part;

Output:

Extract hour from Current date in postgresql :

This query uses the CURRENT_TIMESTAMP function to get the current datetime and then extracts the hour using DATE_PART()

 

SELECT CURRENT_TIMESTAMP AS current_datetime, DATE_PART('hour', CURRENT_TIMESTAMP) AS hour;

Output:

Extract hour from Date in postgresql table using DATE_PART():

We will be using  Below Student_detail table for our example to depict on how to extract hour from date in postgresql

Student_detail:

In the above table we will be using  DATE_PART() Function, which will take “hour” and column named “birthdaytime” as argument. Which will extract hour from “birthdaytime” column and store in the new column of postgresql table as shown below

 

select *, DATE_PART('hour', birthdaytime::timestamp) AS hour from Student_detail

so the resultant table will have hour column

Extract hour from Date in postgresql table using Extract():

We will be using Below Student_detail table for our example to depict on how to extract hour from date in postgresql

Student_detail:

In the above table we will be using  EXTRACT() Function, which will take “hour” and column named “birthdaytime” as argument. Which will extract hour from “birthdaytime” column and store in the new column of postgresql table as shown below

 

Select *, extract(HOUR FROM birthdaytime) as hour from student_detail

So the resultant table will have hour column