NumPy: Count the number of days of specific month

Last update on April 29 2025 13:01:38 (UTC/GMT +8 hours)

3. Count Days in a Specific Month

Write a NumPy program to count the number of days of specific month.

Sample Solution:

Python Code:

# Importing necessary libraries
import numpy as np

# Calculating the number of days in February 2016 using datetime64
print("Number of days, February, 2016: ")
print(np.datetime64('2016-03-01') - np.datetime64('2016-02-01'))

# Calculating the number of days in February 2017 using datetime64
print("Number of days, February, 2017: ")
print(np.datetime64('2017-03-01') - np.datetime64('2017-02-01'))

# Calculating the number of days in February 2018 using datetime64
print("Number of days, February, 2018: ")
print(np.datetime64('2018-03-01') - np.datetime64('2018-02-01')) 

Sample Output:

Number of days, February, 2016:                                        
29 days                                                                
Number of days, February, 2017:                                        
28 days                                                                
Number of days, February, 2018:                                        
28 days

Explanation:

In the above exercise –

np.datetime64('2016-03-01') - np.datetime64('2016-02-01') - This code subtracts the datetime '2016-02-01' from '2016-03-01' using the '-' operator provided by NumPy.

np.datetime64('2017-03-01') - np.datetime64('2017-02-01') - This code does the same operation as above, but with dates from 2017. The result is a timedelta of 28 days, since February has 28 days in 2017.

np.datetime64('2018-03-01') - np.datetime64('2018-02-01') - This code does the same operation as above, but with dates from 2018. The result is also a timedelta of 28 days, since February still has 28 days in 2018.

Pictorial Presentation:

For more Practice: Solve these Related Problems:

• Write a function that calculates the number of days in February for both leap and non-leap years using np.datetime64 arithmetic.
• Compute the number of days in any given month by creating an array of dates for that month and counting its length.
• Compare the day counts for February in different years using np.busday_count to handle business days versus calendar days.
• Implement a solution that subtracts the first day from the last day of a month (plus one) to get the total count, and test it for multiple months.

Go to:

• NumPy DateTime Exercises Home ↩
• NumPy Exercises Home ↩

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