Welcome to Day 39 of your Python journey!
Dates and times are everywhere: scheduling tasks, logging events, timestamping data, or building calendars. Python makes this easy with two powerful modules: datetime and calendar.

Today, you’ll learn how to handle dates, times, and calendars like a pro. ⏰

📦 Importing the Modules

import datetime
import calendar

🕰️ 1. Getting the Current Date and Time

from datetime import datetime

now = datetime.now()
print("Current Date & Time:", now)
print("Date:", now.date())
print("Time:", now.time())

📌 Output:

Current Date & Time: 2025-08-01 14:30:22.123456
Date: 2025-08-01
Time: 14:30:22.123456

📆 2. Creating Custom Dates and Times

from datetime import date, time

# Create a date
my_date = date(2025, 12, 25)
print("Custom Date:", my_date)

# Create a time
my_time = time(14, 30, 0)
print("Custom Time:", my_time)

⏳ 3. Date Arithmetic (Timedelta)

You can perform addition and subtraction with timedelta.

from datetime import timedelta

today = date.today()
future = today + timedelta(days=10)
past = today - timedelta(days=30)

print("Today:", today)
print("10 days later:", future)
print("30 days ago:", past)

🗓️ 4. Formatting and Parsing Dates

✅ Formatting with strftime():

print(now.strftime("%Y-%m-%d %H:%M:%S"))
print(now.strftime("%A, %B %d, %Y"))  # Friday, August 01, 2025

✅ Parsing Strings with strptime():

date_str = "2025-12-31"
parsed_date = datetime.strptime(date_str, "%Y-%m-%d")
print(parsed_date)

📜 5. Working with the calendar Module

The calendar module is perfect for generating and exploring calendar data.

✅ Printing a Month Calendar:

import calendar

print(calendar.month(2025, 8))

✅ Checking Leap Years:

print(calendar.isleap(2024))  # True
print(calendar.isleap(2025))  # False

✅ Getting a Year’s Calendar:

print(calendar.calendar(2025))

⏱️ 6. Measuring Time (Performance Testing)

Use datetime to measure execution time:

start = datetime.now()

# Simulate task
for _ in range(1000000):
    pass

end = datetime.now()
print("Execution Time:", end - start)

🧠 Quick Reference for strftime Codes:

• %Y – Year (2025)
• %m – Month (01-12)
• %d – Day (01-31)
• %H – Hour (00-23)
• %M – Minute (00-59)
• %S – Second (00-59)
• %A – Weekday (Monday)
• %B – Month Name (August)

🎯 Practice Challenge

1. Print today’s date and time in the format: Friday, 01 August 2025 - 02:30 PM
2. Ask the user for their birthdate and calculate their age in days.
3. Display the calendar for the current month.

🧾 Summary

• Use datetime to handle dates, times, and timedeltas.
• Use strftime() and strptime() for formatting and parsing.
• Use calendar to display calendars and check leap years.