how to get a month name from a number

Question

I need a code that can takes a number as an input and tells month and date of the month as output. For example,

USer input: 33 Output: February 2

Can someone help me understand the logic to this problem.

Answer 1

You can use DateTimeFormatter to format your date and withDayOfYear(int dayOfYear) to set the 33th day of the year, as next:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMMM d");
System.out.println(LocalDate.now().withDayOfYear(33).format(formatter));

or as proposed by @Tunaki

System.out.println(Year.now().atDay(33).format(formatter));

Output:

February 2

Answer 2

Alternatively, you could assume a non-leap year and use the following:

package com.company;

public class Main {

    public static void main(String[] args) {
        String[] months = {"Jan.", "Feb.", "Mar.", "Apr.", "May", "Jun.", "Jul.", "Aug.", "Sep.", "Oct.", "Nov.", "Dec."};
        int[] daysinMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        int n = 33; // the input value
        int i = 0;

        n = n % 365;

        while (n > daysinMonth[i]) {
            n -= daysinMonth[i];
            i++;
        }
        System.out.println(months[i] + " " + n);
    }
}