Python | Pandas DatetimeIndex.dayofyear

Python is a great language for doing data analysis, primarily because of the fantastic ecosystem of data-centric python packages. Pandas is one of those packages and makes importing and analyzing data much easier. Pandas DatetimeIndex.dayofyear attribute outputs the ordinal value of the day of the year for each entries of the DatetimeIndex object.

Syntax: DatetimeIndex.dayofyear Return: Index object

Example #1: Use DatetimeIndex.dayofyear attribute to find the ordinal value of the day of the year for each entries in the DatetimeIndex object. Python3

# importing pandas as pd
import pandas as pd

# Create the DatetimeIndex
# Here 'W' represents Weekly frequency
didx = pd.DatetimeIndex(start ='2000-01-10 06:30', freq ='W', 
                            periods = 3, tz ='Asia/Calcutta')

# Print the DatetimeIndex
print(didx)

Output : Now we want to find ordinal value of day for each entries in the DatetimeIndex object. Python3

# find the ordinal value of the day 
# for each entries present in the object
didx.dayofyear

Output : As we can see in the output, the function has returned an Index object containing the ordinal values of the days present in each entry of the DatetimeIndex object.   Example #2: Use DatetimeIndex.dayofyear attribute to find the ordinal value of the day of the year for each entries in the DatetimeIndex object. Python3

# importing pandas as pd
import pandas as pd

# Create the DatetimeIndex
# Here 'M' represents Monthly frequency
didx = pd.DatetimeIndex(start ='2014-08-01 10:05:45', freq ='M',
                               periods = 5, tz ='Asia/Calcutta')

# Print the DatetimeIndex
print(didx)

Output : Now we want to find ordinal value of day for each entries in the DatetimeIndex object. Python3

# find the ordinal value of the day 
# for each entries present in the object
didx.dayofyear

Output : As we can see in the output, the function has returned an Index object containing the ordinal values of the days present in each entry of the DatetimeIndex object.