How to find the day when year, month and date is given?

I need a solution to return day (Monday,Tuesday…), when i have inputs like YEAR, MONTH, DATE.

public static String findDay(int month, int day, int year) { // code here }

    

Answer

Using the parameters, create a LocalDate from which you can get the weekday.

import java.time.LocalDate;
import java.time.format.TextStyle;
import java.util.Locale;

public class Main {
    public static void main(String args[]) {
        // Test
        System.out.println(findDay(2021, 4, 30));
    }

    public static String findDay(int year, int month, int day) {
        LocalDate date = LocalDate.of(year, month, day);
        return date.getDayOfWeek().getDisplayName(TextStyle.FULL, Locale.ENGLISH);
    }
}

Output:

Friday

Learn more about the the the modern date-time API^* from Trail: Date Time.

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^{* For any reason, if you have to stick to Java 6 or Java 7, you can use ThreeTen-Backport which backports most of the java.time functionality to Java 6 & 7. If you are working for an Android project and your Android API level is still not compliant with Java-8, check Java 8+ APIs available through desugaring and How to use ThreeTenABP in Android Project.}