Get the last day of the month

Moving beyond the basics - Diving deeper

Congratulations, you made it past the fast answer. Let's dive deeper to account for alternative methods and potential edge cases.

More ways to find the Last Jedi ... I mean, day

Finagling with datetime and dateutil: Here's how:

from datetime import datetime
from dateutil.relativedelta import relativedelta

# Yoda says, "A leap year, it can be."
year, month = 2023, 2  
last_date = datetime(year, month, 1) + relativedelta(months=1, days=-1)  # Yeah, we've stolen a day from the next month. So what?

print(last_date.date())
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Taming the Pandas for time series: Your data science woes, answered:

import pandas as pd

year, month = 2023, 2  # Time-travel anyone?
last_date = pd.Timestamp(f'{year}-{month}-01') + pd.offsets.MonthEnd()  # Offsets so powerful, it's scary!

print(last_date.date())
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Keeping an eye out for those pesky edge cases

• Need a bit of a leap?: Our friend calendar.monthrange() has your back. It has been handling leap years way before they were cool.
• Oh dear, December!: Watch out for year-end festivities. Revisit your roll over codes to ensure January doesn't feel left out.

# Meet Mr. December, he has a tendency to roll over to next year.
year, month = 2023, 12  
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• Beware of Time thieves: While dealing with time zones and daylight saving time changes, protect your dates. No one likes their days stolen!

Picture perfect with visualisation

A picture is worth a thousand lines of code...

Here's our calendar toolbox:

📆: [January, February, March, ..., December]

And the puzzle pieces of each month's last day. Yeah, we're missing a few:

🧩: [31, ❓, 31, ..., 31]

Wait! calendar.monthrange(year, month) fits the missing piece.

import calendar
year, month = 2023, 2  # Remember to keep your calendar up to date!
_, last_day = calendar.monthrange(year, month)
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And the last piece fits! February's last day:

🧩: [31, **28**, 31, ..., 31]

Your puzzle is now complete!