Get day of year from date or Timestamp in Postgresql

In order to Get day of year from date or Timestamp in postgresql we use Extract() function. Within the Extract keyword we have to mention DOY as we are getting day of year from timestamp.To extract the day of the year from a date in PostgreSQL, you can use the DATE_PART() function with the ‘doy’ (day of the year) unit.

Let’s see how to

  • Extract get day of year from Timestamp in Postgresql
  • Create the column which extracts day of year from timestamp column

With an example for both

 

Extract day of year from Timestamp in Postgresql:

Within the Extract keyword we have to mention DOY as we are getting day of year from timestamp

SELECT EXTRACT (DOY FROM TIMESTAMP '2011-11-22 13:30:15')

So the resultant day of the year will be

Extract Day of the year from timestamp in postgresql 2

 

 

Syntax for DATE_PART() Function in Postresql:

DATE_PART(unit, source) 

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 “doy” (day of the year)

 

Extract Day of Year from Date in postgresql Simple Example:

In order to Extract day of year from date in postgresql we will be using  DATE_PART() function.

In the below Example we will be passing doy as “unit” argument and date as “source” argument in order to extract day of year from Date or datetime

SELECT DATE_PART('doy', '2024-02-24'::timestamp) AS day_of_year_part;

Output:

Extract-day-of-year-from-date-in-PostgreSQL-0

 

Extract Day of Year from Current date in postgresql :

This query uses the CURRENT_DATE function to get the current date and then extracts the day of the year using DATE_PART()

SELECT CURRENT_DATE AS current_date, DATE_PART('doy', CURRENT_DATE) AS day_of_year;

Output:

Extract-day-of-year-from-date-in-PostgreSQL-1

 

 

 

 

EXTRACT day of the year from Timestamp in column of Postgresql table – Extract() :

We use table student_detail

 

Extract-day-of-year-from-date-in-PostgreSQL-2

Create the column which extracts DOY from timestamp column in Postgresql

We have created a column and stored Day of year from Birthdaytime column

SELECT *,EXTRACT (DOY FROM Birthdaytime) AS day_of_year FROM Student_detail

So the resultant table will be

 

Extract-day-of-year-from-date-in-PostgreSQL-3

 

 

Extract Day of Year from Date or timestamp column in postgresql table – DATE_PART() :

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

Student_detail:

Extract-day-of-year-from-date-in-PostgreSQL-2

 

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

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

so the resultant table will have day_of_year column

Extract-day-of-year-from-date-in-PostgreSQL-3

 

 

 

 

                                                                                               

Author

  • Sridhar Venkatachalam

    With close to 10 years on Experience in data science and machine learning Have extensively worked on programming languages like R, Python (Pandas), SAS, Pyspark.

    https://www.linkedin.com/in/sridhar-venkatachalam-74414252/ karaimadai@sg2plcpnl0204.prod.sin2.secureserver.net Venkatachalam Sridhar