YearMonth atDay() method in Java
Last Updated :
03 Feb, 2021
The atDay() method of YearMonth class in Java combines the current year-month with a day-of-month passed as parameter to it to create a LocalDate.
Syntax:
public LocalDate atDay(int dayOfMonth)
Parameter: This method accepts a single parameter dayOfMonth. It is the day-of-month to use. It can take values from 1 to 31.
Return Value: It returns a Local Date formed by the current year-month and a day of month passed as parameter to the function.
Exception: This method throws a DateTimeException, if the day of month passed in the parameter is not valid.
Below programs illustrate the atDay() method of YearMonth in Java:
Program 1:
Java
import java.util.*;
import java.time.*;
public class GfG {
public static void main(String[] args)
{
YearMonth thisYearMonth = YearMonth.of(2017, 8);
LocalDate date = thisYearMonth.atDay(31);
System.out.println(date);
}
}
|
Program 2: To illustrate Exception. The below program throws an exception as September is of 30 days and not 31 days.
Java
import java.util.*;
import java.time.*;
public class GfG {
public static void main(String[] args)
{
YearMonth thisYearMonth = YearMonth.of(2017, 9);
try {
LocalDate date = thisYearMonth.atDay(31);
System.out.println(date);
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
java.time.DateTimeException: Invalid date 'SEPTEMBER 31'
Reference: https://docs.oracle.com/javase/8/docs/api/java/time/YearMonth.html#atDay-int-
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