Python: Check whether a given month and year contains a Monday 13^th

Last update on April 17 2025 13:05:09 (UTC/GMT +8 hours)

Check Monday 13th

Write a Python program to check whether a given month and year contains a Monday 13^th.

Sample Solution-1:

Python Code:

# Import the 'date' class from the 'datetime' module.
from datetime import date

# Define a function 'test' that checks if the 13th day of a given month and year is a Monday.
def test(month, year): 
    # Create a date object for the 13th day of the given month and year.
    # Use the 'strftime' method to get the day of the week (e.g., 'Monday').
    is_monday_13th = date(year, month, 13).strftime("%A") == 'Monday'
    
    # Convert the result to a string and return it.
    return str(is_monday_13th)

# Provide values for the first test case (month=11, year=2022).
month = 11
year = 2022

# Print information about the first test case.
print("Month No.: ", month, " Year: ", year)
# Print the result of checking whether the 13th day of the given month and year is a Monday using the 'test' function.
print("Check whether the said month and year contain a Monday 13th.: " + test(month, year))

# Provide values for the second test case (month=6, year=2022).
month = 6
year = 2022

# Print information about the second test case.
print("\nMonth No.: ", month, " Year: ", year)
# Print the result of checking whether the 13th day of the given month and year is a Monday using the 'test' function.
print("Check whether the said month and year contain a Monday 13th.: " + test(month, year))

Sample Output:

Month No.:  11  Year:  2022
Check whether the said month and year contains a Monday 13th.: False

Month No.:  6  Year:  2022
Check whether the said month and year contains a Monday 13th.: True

Explanation:

Here is a breakdown of the above Python code:

Import Module:

Import the 'date' class from the 'datetime' module.

Define Test Function (test function):

The "test()" function is defined to check if the 13th day of a given month and year is a Monday.
It creates a date object for the 13th day of the given month and year and uses "strftime" to get the day of the week.
The result is compared to 'Monday', and the boolean result is converted to a string.

Flowchart:

Sample Solution-2:

Python Code:

# Import the 'calendar' module to work with calendar-related functions.
import calendar

# Define a function 'test' that checks if the 13th day of a given month and year is a Monday.
def test(month, year): 
    # Use the 'calendar.weekday' function to get the day of the week (0 for Monday) for the 13th day of the given month and year.
    is_monday_13th = calendar.weekday(year, month, 13) == 0
    
    # Convert the result to a string and return it.
    return str(is_monday_13th)

# Provide values for the first test case (month=11, year=2022).
month = 11
year = 2022

# Print information about the first test case.
print("Month No.: ", month, " Year: ", year)
# Print the result of checking whether the 13th day of the given month and year is a Monday using the 'test' function.
print("Check whether the said month and year contain a Monday 13th.: " + test(month, year))

# Provide values for the second test case (month=6, year=2022).
month = 6
year = 2022

# Print information about the second test case.
print("\nMonth No.: ", month, " Year: ", year)
# Print the result of checking whether the 13th day of the given month and year is a Monday using the 'test' function.
print("Check whether the said month and year contain a Monday 13th.: " + test(month, year))

Sample Output:

Month No.:  11  Year:  2022
Check whether the said month and year contains a Monday 13th.: False

Month No.:  6  Year:  2022
Check whether the said month and year contains a Monday 13th.: True

Explanation:

Here is a breakdown of the above Python code:

Import Module:

Import the 'calendar' module to work with calendar-related functions.

Define Test Function (test function):

The "test()" function is defined to check if the 13th day of a given month and year is a Monday.
It uses the 'calendar.weekday' function to get the day of the week (0 for Monday) for the 13th day of the given month and year.
The result is compared to 0 (Monday), and the boolean result is converted to a string.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to check if the 13th day of a given month falls on a Monday using the calendar module.
Write a Python program to determine whether a specified month and year contains a Monday the 13th by using datetime.
Write a Python program to calculate the day of the week for the 13th of a month and verify if it is Monday.
Write a Python program to use the datetime module to check for the occurrence of Monday 13th in a given month-year pair.

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Python: Check whether a given month and year contains a Monday 13th

Python: Check whether a given month and year contains a Monday 13^th