System.currentTimeMillis reflects Absolute Time (Number of millis since 00:00 (Epoch Time)) but System.nanoTime() does not necessarily represent any reference point. Complex and ambiguous concepts of C++ are either eliminated or re-implemented in Java. On the other hand, System.nanoTime() takes 100+ clock cycles. Simple: Java is a simple language because its syntax is simple, clean, and easy to understand. System.currentTimeMillis takes a few clock cycles to perform Read Operation. Java has grown to become one of the most popular programming languages in the world.It is versatile, relatively easy to use, and has a wide range of use cases. System.currentTimeMillis takes somewhere between 1/1000th of a second to 15/1000th of a second (depending on the system) but System.nanoTime() takes around 1/1000,000th of a second (1,000 nanos). In principle, they both perform the same action but are different in the following ways: There are two standard ways to time operations in Java: System.currentTimeMillis() and System.nanoTime() The question is, which of these to choose and under what circumstances. 
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