Lecture 31:- Day Before N Days In Python

To find the date that was N days before a given date in Python, you can use the datetime module. The datetime module provides the timedelta class, which allows you to perform arithmetic with dates. Here's how you can find the date that was N days before a given date:

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from datetime import datetime, timedelta def date_before_n_days(date_string, n):    date_format = "%Y-%m-%d"    given_date = datetime.strptime(date_string, date_format)    before_date = given_date - timedelta(days=n)    return before_date.strftime(date_format) # Example usage: given_date_string = "2023-07-27" days_before = 5 result = date_before_n_days(given_date_string, days_before) print(f"The date {days_before} days before {given_date_string} is: {result}")

In this example, the date_before_n_days() function takes two parameters: date_string, which is the given date in the format "YYYY-MM-DD," and n, which represents the number of days before the given date. The function first converts the date_string into a datetime object using strptime(). Then, it calculates the date that was n days before the given date using the timedelta object. Finally, it converts the resulting datetime object back to a string in the same format using strftime() and returns the result.

For the given date "2023-07-27" and 5 days before, the program will print: “The date 5 days before 2023-07-27 is: 2023-07-22.”