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Showing content from https://www.tutorialspoint.com/java/lang/system_currenttimemillis.htm below:

Java System currentTimeMillis() Method

The Java System currentTimeMillis() method returns the current time in milliseconds.The unit of time of the return value is a millisecond, the granularity of the value depends on the underlying operating system and may be larger.

For example, many operating systems measure time in units of tens of milliseconds.

Following is the declaration for java.lang.System.currentTimeMillis() method

public static long currentTimeMillis()

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This method returns the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC(coordinated universal time).

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The following example shows the usage of Java System currentTimeMillis() method. In this example, we're printing the current time in milliseconds using System.currentTimeMillis() method.

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) {

      // returns the current time in milliseconds
      System.out.print("Current Time in milliseconds = ");
      System.out.println(System.currentTimeMillis());
   }
} 

Let us compile and run the above program, this will produce the following result −

Current Time in milliseconds = 1719557974290

The following example shows the usage of Java System currentTimeMillis() method. In this example, we've noted down the start time of a code snippet by getting the current time in millis and then code is executed in a for loop with a sleep() statement. Once loop is completed, we've again noted down the end time by getting the current time in milliseconds.

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) throws InterruptedException {

      // start time of the code snippet
      long startTime = System.currentTimeMillis();

      int sum = 0;
      // a time consuming task
      for (int i = 0; i < 10; i++) {
         // sleep for 100 ms
         Thread.sleep(100);
         sum += i;
      }
      // end time of the code snippet
      long endTime = System.currentTimeMillis();

      System.out.println("Program took " +
         (endTime - startTime) + " ms") ;
   }
} 

Let us compile and run the above program, this will produce the following result −

Program took 1097 ms

java_lang_system.htm

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