PySpark SQL Functions | dayofweek method

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PySpark SQL Functions

schedule Jul 1, 2022

Last updated

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Parameters

1. col | string or Column

The date column from which to extract the day of the week.

Return Value

A Column of integers.

Examples

Consider the following PySpark DataFrame with some datetime values:


        
        
            
                
                
                    import datetime
df = spark.createDataFrame([["Alex", datetime.date(1995,12,16)], ["Bob", datetime.date(1995,5,9)]], ["name", "birthday"])
df.show()
                
            
            +----+----------+
|name|  birthday|
+----+----------+
|Alex|1995-12-16|
| Bob|1995-05-09|
+----+----------+

Getting the day of the week from datetime values in PySpark DataFrame

To get the day of the week in PySpark DataFrame:


        
        
            
                
                
                    import pyspark.sql.functions as F
df.select(F.dayofweek('birthday').alias('day')).show()
                
            
            +---+
|day|
+---+
|  7|
|  1|
+---+

Here:

7 represents Sunday while 1 represents Monday.
we are using alias(~) to give a label to the Column object returned by dayofweek(~).

Getting the day of week from date strings in PySpark DataFrame

Note that the method still works even if the date is in string form:


        
        
            
                
                
                    df = spark.createDataFrame([["Alex", "1995-12-16"], ["Bob", "1990-05-06"]], ["name", "birthday"])
df.select(F.dayofweek("birthday").alias("day")).show()
                
            
            +---+
|day|
+---+
|  7|
|  1|
+---+

Published by Isshin Inada

Edited by 0 others

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Official PySpark Documentation

https://spark.apache.org/docs/latest/api/python/reference/api/pyspark.sql.functions.dayofweek.html

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