3280. Convert Date to Binary

Method 1

You are given a string date representing a Gregorian calendar date in the yyyy-mm-dd format.
date can be written in its binary representation obtained by converting year, month, and day to their binary representations without any leading zeroes and writing them down in year-month-day format.
Return the binary representation of date.

Example 1

Input: date = "2080-02-29"

Output: "100000100000-10-11101"

Explanation:

100000100000, 10, and 11101 are the binary representations of 2080, 02, and 29 respectively.

Example 2

Input: date = "1900-01-01"

Output: "11101101100-1-1"

Explanation:

11101101100, 1, and 1 are the binary representations of 1900, 1, and 1 respectively.

Method 1

【O(1) time | O(1) space】

package Leetcode.Math;

/**
 * @author zhengxingxing
 * @date 2025/01/01
 */
public class ConvertDateToBinary {
    public static String convertToBinary(String date) {
        // Split the date string
        String[] parts = date.split("-");

        // Convert year, month, and day to integers
        int year = Integer.parseInt(parts[0]);
        int month = Integer.parseInt(parts[1]);
        int day = Integer.parseInt(parts[2]);

        // Convert to binary and remove leading zeros
        String binaryYear = Integer.toBinaryString(year);
        String binaryMonth = Integer.toBinaryString(month);
        String binaryDay = Integer.toBinaryString(day);

        // Concatenate the result in the required format
        return binaryYear + "-" + binaryMonth + "-" + binaryDay;
    }

    public static void main(String[] args) {
        // Test case 1
        String date1 = "2080-02-29";
        System.out.println("Test case 1:");
        System.out.println("Input: " + date1);
        System.out.println("Output: " + convertToBinary(date1));

        // Test case 2
        String date2 = "1900-01-01";
        System.out.println("\nTest case 2:");
        System.out.println("Input: " + date2);
        System.out.println("Output: " + convertToBinary(date2));

        // Additional test case
        String date3 = "2024-03-20";
        System.out.println("\nTest case 3:");
        System.out.println("Input: " + date3);
        System.out.println("Output: " + convertToBinary(date3));
    }
}

Method 1

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