<h2 id="heading-systemcurrenttimemillis">System.currentTimeMillis()</h2>
<ul>
<li>returns current value of running java virtual machine high resolution time source in nanoseconds.</li>
<li>The value returned represents nanoseconds since some fixed but arbitrary origin time, </li>
<li>other jvm instance will use different origin. Origin is nothing but used to keep track of the time from the start of the jvm </li>
<li><pre><code class="lang-java"><span class="hljs-keyword">long</span> startTime=System.currentTimeMillis();
<span class="hljs-comment">//output : 1663132233612</span>
</code></pre>
</li>
</ul>
<h5 id="heading-how-to-use-this">How to use this</h5>
<pre><code class="lang-java"> <span class="hljs-keyword">long</span> startTime = System.nanoTime(); 
   <span class="hljs-comment">// ... the code being measured ...   </span>
 <span class="hljs-keyword">long</span> estimatedTime = System.nanoTime() - startTime;
</code></pre>


## System.currentTimeMillis() 
- returns current value of running java virtual machine high resolution time source in nanoseconds.
- The value returned represents nanoseconds since some fixed but arbitrary origin time, 
- other jvm instance will use different origin. Origin is nothing but used to keep track of the time from the start of the jvm 
- 
```java
long startTime=System.currentTimeMillis();
//output : 1663132233612
```

##### How to use this 
```java
 long startTime = System.nanoTime(); 
   // ... the code being measured ...   
 long estimatedTime = System.nanoTime() - startTime;
 
```



JAVA : System.currentTimeMillis()

System.currentTimeMillis()

How to use this