Python program to filter future dates

Last update on April 22 2025 12:54:14 (UTC/GMT +8 hours)

10. Future Date Filter

Write a Python program that implements a Python program that filters out dates (in the format "YYYY-MM-DD") that are in the future using the filter function.

Sample Solution:

Python Code:

from datetime import datetime

# Define a list of dates in "YYYY-MM-DD" format
date_strings = ["2023-07-11", "2022-02-22", "2024-05-11", "2025-12-31", "2021-01-01"]
print("List of dates:")
print(date_strings)
# Convert the date strings to datetime objects
dates = [datetime.strptime(date, "%Y-%m-%d") for date in date_strings]

# Get the current date
current_date = datetime.now()
print("Current date:",current_date)

# Define a function to check if a date is in the future
def is_date_in_future(date):
    return date > current_date

# Use the filter function to extract dates in the past
dates_in_past = list(filter(is_date_in_future, dates))

# Convert the filtered dates back to strings
filtered_date_strings = [date.strftime("%Y-%m-%d") for date in dates_in_past]
print("\nCheck if a date is in the future!")
# Print the dates in the past
print(filtered_date_strings)

Explanation:

In the exercise above -

First, we start with a list of date strings in the "YYYY-MM-DD" format.
Convert date strings to datetime objects using datetime.strptime.
We get the current date and time using datetime.now().
Define a function "is_date_in_future()" that checks if a date is in the future by comparing it with the current date.
Use the filter function to filter out dates in the future from the dates list by applying the "is_date_in_future()" function as the filtering condition.
The filtered datetime objects are then converted back to date strings using strftime with the "YYYY-MM-DD" format.
Finally, we print the dates in the future.

Sample Output:

List of dates:
['2023-07-11', '2022-02-22', '2024-05-11', '2025-12-31', '2021-01-01']
Current date: 2023-09-30 10:04:30.206035

Check if a date is in the future!
['2024-05-11', '2025-12-31']

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to filter out dates in the future from a list of 'YYYY-MM-DD' formatted strings and return only the past dates sorted in descending order.
Write a Python function that uses the filter function to separate dates from the current year and those in the future.
Write a Python program to filter a list of dates, excluding those that are after today, and then reformat the remaining dates to 'DD/MM/YYYY'.
Write a Python program to filter out future dates from a list and then calculate the number of days each remaining date is from today.

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