LeetCode 1853: Convert Date Format Solution

Master LeetCode problem 1853 (Convert Date Format), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

1853. Convert Date Format

Easy

Database

Problem Explanation

Explanation:

To convert a date string from the format "YYYY-MM-DD" to "DD-MM-YYYY", we can split the original string by the delimiter "-", and then rearrange the parts accordingly.

Algorithm:

Split the input date string by the delimiter "-" to extract the year, month, and day.
Rearrange the parts to form the new date string in the required format "DD-MM-YYYY".
Return the new date string.

Time Complexity:

The time complexity of this algorithm is O(1) because the input date string format is fixed.

Space Complexity:

The space complexity is also O(1) as we are not using any extra space that grows with the input size.

: :

Solution Code

class Solution {
    public String reformatDate(String date) {
        String[] parts = date.split("-");
        return parts[2] + "-" + getMonth(parts[1]) + "-" + parts[0];
    }
    
    private String getMonth(String month) {
        switch(month) {
            case "Jan":
                return "01";
            case "Feb":
                return "02";
            case "Mar":
                return "03";
            case "Apr":
                return "04";
            case "May":
                return "05";
            case "Jun":
                return "06";
            case "Jul":
                return "07";
            case "Aug":
                return "08";
            case "Sep":
                return "09";
            case "Oct":
                return "10";
            case "Nov":
                return "11";
            case "Dec":
                return "12";
            default:
                return "";
        }
    }
}

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