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Python calendar.setfirstweekday() Function

The Python calendar.setfirstweekday() function sets the first day of the week for the calendar module.

By default, the first weekday is set to Monday (0), but it can be changed to any other day of the week.

Following is the syntax of the Python calendar.setfirstweekday() function −

calendar.setfirstweekday(weekday)

This function accepts an integer (0-6) as a parameter representing the new first weekday.

This function does not return a value. It updates the first weekday setting for the calendar module.

In this example, we change the first weekday to Sunday using the calendar.setfirstweekday() function −

import calendar

# Set first weekday to Sunday
calendar.setfirstweekday(calendar.SUNDAY)

# Verify the change
print("Updated first weekday:", calendar.firstweekday())  

Following is the output obtained −

Updated first weekday: 6

We can also set the first weekday to any other day, like Wednesday using the calendar.setfirstweekday() function −

import calendar

# Set first weekday to Wednesday
calendar.setfirstweekday(calendar.WEDNESDAY)

# Verify the change
print("Updated first weekday:", calendar.firstweekday())  

Following is the output of the above code −

Updated first weekday: 2

Changing the first weekday affects how the month calendar is displayed as shown in the example below −

import calendar

# Set first weekday to Friday
calendar.setfirstweekday(calendar.FRIDAY)

# Print the month calendar for March 2025
print(calendar.month(2025, 3))

We get the output as shown below −

    March 2025
Fr Sa Su Mo Tu We Th
       1  2  3  4  5
 6  7  8  9 10 11 12
13 14 15 16 17 18 19
...

To reset the first weekday back to Monday, we explicitly set it again as shown in the following example −

import calendar

# Reset to default (Monday)
calendar.setfirstweekday(calendar.MONDAY)

# Verify the change
print("Reset first weekday:", calendar.firstweekday())  

The result produced is as follows −

Reset first weekday: 0

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