Calendar module in python

Python Calendar Module – Complete Guide with Examples

The calendar module in Python is used to work with dates, months, and year-based calendars. It can display the calendar for a month or entire year, check leap years, count leap days, and more.

Python provides this module as part of its powerful standard library, which contains hundreds of ready-to-use functions for date calculations.

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Why Use the Calendar Module?

• To print calendar of a month or a whole year
• To check whether a year is leap year
• To count number of leap years between two years
• To get weekday index for any date
• To design schedule/calendar-based applications

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Basic Example of Calendar Module

import calendar

# Print calendar of March 2014
print(calendar.month(2014, 3))

# Get first weekday (0=Monday, 6=Sunday)
print(calendar.firstweekday())

# Check leap year
if calendar.isleap(2020):
    print("The year is leap year")
else:
    print("The year is not leap year")

# Count total leap years between two years
print(calendar.leapdays(1950, 2000))

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Print Full Year Calendar

print("The calendar of year 2018 is:")
print(calendar.calendar(2018, 2, 1, 6))

Parameters:

• 2018 → Year
• 2 → Width between columns
• 1 → Number of lines per week
• 6 → Number of columns

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Useful Calendar Module Functions

1. calendar.month(year, month)

Displays formatted month calendar.

2. calendar.calendar(year)

Displays full year calendar.

3. calendar.isleap(year)

Returns True if leap year.

4. calendar.weekday(year, month, day)

Returns weekday index (0 = Monday).

5. calendar.monthrange(year, month)

Returns (first_weekday, total_days_in_month).

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Assignment 1: Calculate Age in Years, Months, Days

Solution by Shiva Sir:

from datetime import date

a = date(date.today().year, date.today().month, date.today().day)
b = date(
    int(input("enter year")),
    int(input("enter month")),
    int(input("enter day"))
)

# Calculate month difference
if a.month > b.month:
    months = a.month - b.month
else:
    months = b.month - a.month

# Year difference
years = a.year - b.year

# Day difference
if a.day > b.day:
    days = a.day - b.day
else:
    days = b.day - a.day

print('{0} years, {1} months, {2} days'.format(years, months, days))

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Assignment 2: Day Before & After Calculator

Write a program where user enters number of days and the script prints:

• Date before those days
• Date after those days

Hint: Use timedelta from datetime.

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Assignment 3: Create a Stopwatch

Write a Python program where:

• Press s → Start
• Press p → Pause
• Press e → End

Hint: Use time.time() to capture start and end timestamps.

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Extra Concepts Added for Better Understanding

1. Get Weekday Name

import calendar
days = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]

print(days[ calendar.weekday(2025, 12, 25) ])

2. Get Total Days in a Month

import calendar
first, total = calendar.monthrange(2025, 5)
print("Total days:", total)

3. Generate Calendar as a Matrix

print(calendar.monthcalendar(2025, 1))

4. Iterate Through All Dates of a Month

import calendar

for week in calendar.monthcalendar(2025, 1):
    print(week)