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 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:
// 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); } } |
2019-11-01 2019-11-01T00:00
Program 2: Program with parameters.
// 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); } } |
2018-01-20 2018-01-20T00:00Z[Etc/UTC]
Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDate.html#atStartOfDay()
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.