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Python | Pandas Series.dt.dayofyear

  • Last Updated : 20 Mar, 2019

Series.dt can be used to access the values of the series as datetimelike and return several properties. Pandas Series.dt.dayofyear attribute return the ordinal day of the year in the underlying datetime based data in the given series object.

Syntax: Series.dt.dayofyear

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Parameter : None



Returns : numpy array

Example #1: Use Series.dt.dayofyear attribute to return the ordinal day of the year in the underlying data of the given Series object.




# importing pandas as pd
import pandas as pd
  
# Creating the Series
sr = pd.Series(['2012-10-21 09:30', '2019-7-18 12:30', '2008-02-2 10:30',
                '2010-4-22 09:25', '2019-11-8 02:22'])
  
# Creating the index
idx = ['Day 1', 'Day 2', 'Day 3', 'Day 4', 'Day 5']
  
# set the index
sr.index = idx
  
# Convert the underlying data to datetime 
sr = pd.to_datetime(sr)
  
# Print the series
print(sr)

Output :

Now we will use Series.dt.dayofyear attribute to return the ordinal day of the year in the datetime based data in the given series object.




# return the day of year
result = sr.dt.dayofyear
  
# print the result
print(result)

Output :

As we can see in the output, the Series.dt.dayofyear attribute has successfully accessed and returned the day of year in the underlying data of the given series object.
 
Example #2 : Use Series.dt.dayofyear attribute to return the ordinal day of the year in the underlying data of the given Series object.




# importing pandas as pd
import pandas as pd
  
# Creating the Series
sr = pd.Series(pd.date_range('2012-12-12 12:12'
                       periods = 5, freq = 'M'))
  
# Creating the index
idx = ['Day 1', 'Day 2', 'Day 3', 'Day 4', 'Day 5']
  
# set the index
sr.index = idx
  
# Print the series
print(sr)

Output :

Now we will use Series.dt.dayofyear attribute to return the ordinal day of the year in the datetime based data in the given series object.




# return the day of year
result = sr.dt.dayofyear
  
# print the result
print(result)

Output :

As we can see in the output, the Series.dt.dayofyear attribute has successfully accessed and returned the day of year in the underlying data of the given series object.




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