We use cookies (including Google cookies) to personalize ads and analyze traffic. By continuing to use our site, you accept our Privacy Policy.

SimplyLeet
TagsCompaniesDisclaimersPrivacyTermsContactAbout Us

Next Day

Number: 2822

Difficulty: Easy

Paid? Yes

Companies: N/A

Problem Description

Enhance all date objects so that calling date.nextDay() on any date object returns the next day as a string in the format YYYY-MM-DD. For example, for the input date "2014-06-20", invoking nextDay() should return "2014-06-21". The solution must correctly handle month and year transitions (e.g., from October 31 to November 1).

Key Insights

  • The problem deals with date arithmetic: adding one day to a given date.
  • Handling month and year transitions (including leap years) is critical.
  • The built-in date libraries in different languages can simplify the arithmetic.
  • For JavaScript, extending the prototype of Date is straightforward.
  • For other languages like Python, C++, and Java, we utilize their date libraries or helper functions for clear and robust solutions.

Space and Time Complexity

Time Complexity: O(1) – Date arithmetic and formatting are constant time operations. Space Complexity: O(1) – Only a few extra variables are needed for calculation and output.

Solution

We solve the problem by leveraging each language’s built-in support for date manipulation:

  • In JavaScript, we extend the Date prototype with a new method, nextDay(), which creates a new Date object by adding one day (24 hours in milliseconds) to the current date. The new date is then formatted to YYYY-MM-DD.
  • In Python, we can monkey-patch the datetime.date class (if desired) by adding a nextDay method that returns the next day string. We use timedelta to add one day and then format the result.
  • In C++, since there is no built-in date object in the standard library (prior to C++20), we use std::chrono (or a manual adjustment using the tm struct) to compute the next day and format it as a string.
  • In Java, we rely on the java.time.LocalDate class (introduced in Java 8) to simply add one day using plusDays(1) and then format the result using the standard formatting methods.

These approaches all use constant-time arithmetic and string formatting functions available in each language’s standard library.

Code Solutions

# Import necessary classes from the datetime module.
import datetime

# Define a nextDay method that can be attached to datetime.date.
def nextDay(self):
    # Add one day using timedelta.
    next_date = self + datetime.timedelta(days=1)
    # Return the date formatted as YYYY-MM-DD.
    return next_date.strftime("%Y-%m-%d")

# Monkey-patch the datetime.date class to include nextDay.
datetime.date.nextDay = nextDay

# Example usage:
if __name__ == "__main__":
    # Create a date object.
    sample_date = datetime.date(2014, 6, 20)
    # Call the nextDay method and print the result.
    print(sample_date.nextDay())  # Output: "2014-06-21"
← Back to All Questions