LocalDate atStartOfDay() method in Java with Examples

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The atStartOfDay() method of LocalDate class in Java is combines this date with the time of midnight to create a LocalDateTime at the start of this date. Syntax:

public ZonedDateTime atStartOfDay(ZoneId zone)

Parameter: This method accepts a parameter zone which is the zone ID to be used and not necessary null. The parameter is not mandatory. Return Value: It returns the local date-time of midnight at the start of this date, not null. Below programs illustrate the atStartOfDay() method of LocalDate in Java: Program 1:

Java

// Program to illustrate the atStartOfDay() method
 
import java.util.*;
import java.time.*;
 
public class GfG {
    public static void main(String[] args)
    {
        // parses the local date
        LocalDate dt = LocalDate.parse("2019-11-01");
        System.out.println(dt);
 
        // Function call
        LocalDateTime dt1 = dt.atStartOfDay();
        System.out.println(dt1);
    }
}

Output:

2019-11-01
2019-11-01T00:00

Program 2: Program with parameters.

Java

// Program to illustrate the atStartOfDay() method
 
import java.util.*;
import java.time.*;
 
public class GfG {
    public static void main(String[] args)
    {
 
        // parses the local date
        LocalDate dt = LocalDate.parse("2018-01-20");
        System.out.println(dt);
 
        // Function call
        ZonedDateTime dt1 = dt.atStartOfDay(ZoneId.systemDefault());
        System.out.println(dt1);
    }
}