Java Clock class is part of Date Time API, java.time.Clock, of Java. The Java Date Time API was added from Java version 8.
The millis() method of Clock class returns the current instant of the clock in milliseconds. A millisecond instant is measured from 1970-01-01T00:00Z (UTC) to the current time. This method does the same work as System.currentTimeMillis() method. If the creation of an object is unacceptable, then this method is used to allow the use of java.time.Clock in high-performance use cases.
Syntax:
public long millis()
Return Value: This method returns the current instant of the clock in milliseconds.
Exception: This method throws DateTimeException if the instant cannot be obtained from Clock.
Example::
Code: Clock clock = Clock.systemDefaultZone(); long milliSeconds=clock.millis(); System.out.println(milliSeconds); Output:: 1534749202051 Explanation:: when millis() is called, then it returns a current instant of Class Object in milliseconds.
Below programs illustrates millis() method of java.time.Clock class:
Program 1: Using millis() with Clock object created with systemDefaultZone
Java
// Java program to demonstrate millis()// method of Clock classimport java.time.*;// create classpublic class millisMethodDemo { // Main method public static void main(String[] args) { // create Clock Object Clock clock = Clock.systemDefaultZone(); // get Instant Object of Clock object // in milliseconds using millis() method long milliseconds = clock.millis(); // print details of milliseconds variable System.out.println("Instant for class name " + clock + " in milliseconds is " + milliseconds); }} |
Instant for class name SystemClock[Etc/UTC] in milliseconds is 1623838188802
Program 2: Using millis with Clock object created with Zone “Europe/Paris”
Java
// Java program to demonstrate millis()// method of Clock classimport java.time.*;// create classpublic class millisMethodDemo { // Main method public static void main(String[] args) { // create a Zone Id for Europe/Paris ZoneId zoneId = ZoneId.of("Europe/Paris"); // create Clock Object by passing zoneID Clock clock = Clock.system(zoneId); // get Instant Object of Clock object // in milliseconds using millis() method long milliseconds = clock.millis(); // print details of milliseconds variable System.out.println("Instant for clock class" + " in milliseconds is " + milliseconds); }} |
Instant for clock class in milliseconds is 1623837795533
Reference: https://docs.oracle.com/javase/8/docs/api/java/time/Clock.html#millis–
