Python Calendar Module: A Comprehensive Guide with Example Project

Python Calendar Module is a powerful tool that provides various functionalities for working with dates, months, and years. It allows users to perform a wide range of operations related to calendars, including displaying calendars, determining leap years, and calculating dates.

In this comprehensive guide, we will explore the various functionalities offered by the Python Calendar Module and provide a practical example project to demonstrate its usage.

Table of Contents

  1. Getting Started
    • Installation
    • Importing the Calendar Module
  2. Basic Usage
    • Displaying a Calendar
    • Determining Leap Years
    • Finding Weekday of a Given Date
    • Counting the Number of Days in a Month
  3. Advanced Usage
    • Formatting Calendar Output
    • Calculating Time Intervals
    • Working with Dates
  4. Example Project: Event Scheduler
    • Project Overview
    • Implementation Steps
  5. Conclusion
  1. Getting Started
  2. Installation

    The Python Calendar Module is part of the Python standard library, so you don't need to install any additional packages. Simply ensure you have Python installed on your system, and you're good to go.

    Importing the Calendar Module

    Before using the Calendar Module, you need to import it into your Python script. You can do this using the following import statement:

    import calendar
  3. Basic Usage
  4. Displaying a Calendar

    One of the primary functions of the Calendar Module is to display calendars. The calendar.month() function allows you to generate a month's calendar for a specific year and month.

    import calendar
    year = 2023
    month = 7
    print(calendar.month(year, month))

    You can watch the video below:

    Determining Leap Years

    You can use the calendar.isleap() function to check if a year is a leap year or not.

    import calendar
    year = 2023
    if calendar.isleap(year):
        print(f"{year} is a leap year.")
        print(f"{year} is not a leap year.")

    Finding Weekday of a Given Date

    The calendar.weekday() function returns the weekday (0 for Monday, 1 for Tuesday, etc.) of a specified date.

    import calendar
    year = 2023
    month = 7
    day = 30
    weekday = calendar.weekday(year, month, day)
    print(f"The weekday of {day}/{month}/{year} is {calendar.day_name[weekday]}.")

    Counting the Number of Days in a Month

    To get the number of days in a specific month of a given year, use the calendar.monthrange() function.

    import calendar
    year = 2023
    month = 7
    num_days = calendar.monthrange(year, month)[1]
    print(f"The number of days in {calendar.month_name[month]}, {year} is {num_days}.")
  5. Advanced Usage
  6. Formatting Calendar Output

    The Calendar Module allows you to customize the calendar's appearance. You can use the calendar.TextCalendar class and its methods for this purpose.

    import calendar
    year = 2023
    month = 7
    cal = calendar.TextCalendar(calendar.SUNDAY)
    month_calendar = cal.formatmonth(year, month)

    Calculating Time Intervals

    You can calculate the time between two dates using the calendar.timegm() function.

    import calendar
    from datetime import datetime
    start_date = datetime(2023, 1, 1)
    end_date = datetime(2023, 12, 31)
    start_timestamp = calendar.timegm(start_date.utctimetuple())
    end_timestamp = calendar.timegm(end_date.utctimetuple())
    time_interval_seconds = end_timestamp - start_timestamp
    time_interval_days = time_interval_seconds / (3600 * 24)
    print(f"The time interval between the two dates is {time_interval_days} days.")

    Working with Dates

    The calendar.datetime.datetime class provides additional functionalities for working with dates.

    import calendar
    from datetime import datetime
    # Get the current date and time
    now =
    print("Current Date and Time:", now)
    # Get the current date
    current_date =
    print("Current Date:", current_date)
    # Get the current time
    current_time = now.time()
    print("Current Time:", current_time)
  7. Example Project: Event Scheduler
  8. Project Overview

    In this example project, we will build a simple event scheduler that allows users to add and view events for specific dates.

    Implementation Steps

    1. Initialize the Event Scheduler.
    2. Provide options to the user: Add an event or view events.
    3. If the user chooses to add an event, collect event details such as date, time, and description.
    4. Store the events in a data structure like a dictionary or list.
    5. If the user chooses to view events for a date, display the events scheduled for that date.
    6. Implement a loop to let the user continue using the event scheduler until they decide to exit.
    import calendar
    # Initialize the Event Scheduler
    event_scheduler = {}
    # Function to add an event
    def add_event():
        print("\nEnter event details:")
        date = input("Date (YYYY-MM-DD): ")
        time = input("Time: ")
        description = input("Description: ")
        if date in event_scheduler:
            event_scheduler[date].append((time, description))
            event_scheduler[date] = [(time, description)]
        print("\nEvent added successfully!")
    # Function to view events for a date
    def view_events():
        date = input("\nEnter the date to view events (YYYY-MM-DD): ")
        if date in event_scheduler:
            print(f"\nEvents scheduled for {date}:")
            for idx, event in enumerate(event_scheduler[date], start=1):
                time, description = event
                print(f"{idx}. Time: {time}, Description: {description}")
            print("No events scheduled for this date.")
    # Main loop to let the user continue using the event scheduler
    while True:
        print("\nEvent Scheduler Menu:")
        print("1. Add Event")
        print("2. View Events for a Date")
        print("3. Exit")
        choice = input("\nEnter your choice (1/2/3): ")
        if choice == "1":
        elif choice == "2":
        elif choice == "3":
            print("\nExiting the Event Scheduler.")
            print("\nInvalid choice. Please try again.")

    This code sets up an Event Scheduler with options to add events or view events for a specific date. It uses a dictionary event_scheduler to store events, where the keys are dates, and the values are lists of tuples containing the time and description of the events. The code provides a simple command-line interface for the user to interact with the Event Scheduler and continues to prompt for actions until the user chooses to exit by entering "3".

  9. Conclusion
  10. The Python Calendar Module is a versatile tool for handling dates, months, and years. It provides numerous functions to perform common date-related operations efficiently. In this guide, we explored basic and advanced functionalities of the module and demonstrated how to use it in a practical example project.

    With the Python Calendar Module at your disposal, you can easily manage calendars, dates, and time intervals in your Python applications. Happy coding!