faketime/Test.java at master · imdahmd/faketime · GitHub

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import java.util.Date;


public class Test {
	 public static void main(String[] args) throws  Throwable {
		 	System.out.println(System.getProperties());

	          java.lang.reflect.Method m = java.lang.ClassLoader.class.getDeclaredMethod("loadLibrary", Class.class, String.class, Boolean.TYPE);
	          m.setAccessible(true);
	          m.invoke(null, java.lang.System.class, "jvmfaketime", false);


	        System.out.println(System.currentTimeMillis());
	        System.out.println(new Date());
	        System.registerFakeCurrentTimeMillis();
	        System.out.println(System.currentTimeMillis());
	        System.out.println(new Date());
	        System.deregisterFakeCurrentTimeMillis();
	        System.out.println(System.currentTimeMillis());
	        System.out.println(new Date());

	        System.registerFakeCurrentTimeMillis();

	        System.out.println("offset " + System.getTimeOffset() + " " + new Date());
	        System.setTimeOffset(2000);
	        System.out.println("offset " + System.getTimeOffset() + " " + new Date());

	 }
}