Next day

85.8% acceptance

Mar 31, 2026

Write code that enhances all date objects such that you can call the date.nextDay() method on any date object and it will return the next day in the format YYYY-MM-DD as a string.

Solution

TypeScript

Time O(1)

Space O(1)

LeetCode

solution.ts

interface Date {
  nextDay(): string;
}

Date.prototype.nextDay = function(): string {
  const next = new Date(this);
  next.setDate(next.getDate() + 1);
  const y = next.getFullYear();
  const m = String(next.getMonth() + 1).padStart(2, '0');
  const d = String(next.getDate()).padStart(2, '0');
  return `${y}-${m}-${d}`;
}

/**
 * const date = new Date("2014-06-20");
 * date.nextDay(); // "2014-06-21"
 */