Python Pandas - Indicate whether the date in DateTimeIndex is the first day of the year

To check whether the date in DateTimeIndex is the first day of the year, use the DateTimeIndex.is_year_start property.

At first, import the required libraries −

import pandas as pd

Create a DatetimeIndex with period 6 and frequency as D i.e. days −

datetimeindex = pd.date_range('2021-12-30 02:30:50', periods=6, tz='Australia/Adelaide', freq='1D')

Display DateTimeIndex −

print("DateTimeIndex...
", datetimeindex)

Check whether the date in DateTimeIndex is the first day of the year −

print("
Check whether the date in DateTimeIndex is the first day of the year...
",
datetimeindex.is_year_start)

Example

Following is the code −

import pandas as pd

# DatetimeIndex with period 6 and frequency as D i.e. days
# The timezone is Australia/Adelaide
datetimeindex = pd.date_range('2021-12-30 02:30:50', periods=6, tz='Australia/Adelaide', freq='1D')

# display DateTimeIndex
print("DateTimeIndex...
", datetimeindex)

# display DateTimeIndex frequency
print("DateTimeIndex frequency...
", datetimeindex.freq)

# Check whether the date in DateTimeIndex is the first day of the year
print("
Check whether the date in DateTimeIndex is the first day of the year...
",
datetimeindex.is_year_start)

Output

This will produce the following code −

DateTimeIndex...
DatetimeIndex(['2021-12-30 02:30:50+10:30', '2021-12-31 02:30:50+10:30',
'2022-01-01 02:30:50+10:30', '2022-01-02 02:30:50+10:30',
'2022-01-03 02:30:50+10:30', '2022-01-04 02:30:50+10:30'],
dtype='datetime64[ns, Australia/Adelaide]', freq='D')
DateTimeIndex frequency...
<Day>

Check whether the date in DateTimeIndex is the first day of the year...
[False False True False False False]

AmitDiwan

Updated on 18-Oct-2021 12:49:48

• Related Questions & Answers
• Python Pandas - Indicate whether the date in DateTimeIndex is the last day of the year
• Python Pandas - Indicate whether the date in DateTimeIndex is the first day of the month
• Python Pandas - Indicate whether the date in DateTimeIndex is the first day of the quarter
• Python Pandas - Indicate whether the date in DateTimeIndex is the last day of the month
• Python Pandas - Indicate whether the date in DateTimeIndex is the last day of the quarter
• Python Pandas - Indicate whether the date in DateTimeIndex belongs to a leap year or not
• Python Pandas - Extract the ordinal day of year from the DateTimeIndex with specific time series frequency
• Python Pandas - Indicate if the date from the PeriodIndex object belongs to a leap year
• Python Pandas - Get the Day of the year from Period object
• Day of the Year in Python
• Python Pandas - Check whether the year is a leap year from the Period object
• Python Pandas - Create a PeriodIndex and get the day of the year
• Python Pandas - Extract the day from the DateTimeIndex with specific time series frequency
• Python Pandas - Extract the day of week from the DateTimeIndex with specific time series frequency
• Python Pandas - Extract year from the DateTimeIndex with specific time series frequency