Retrieve the current system time
<response>
<version>2</version>
<code>200</code>
<text>OK</text>
<currentTime>1270614730908</currentTime>
<data class="time">
<references/>
<time>
<time>1270614730908</time>
<readableTime>2010-04-06T21:32:10-07:00</readableTime>
</time>
</data>
</response>