Ask how the 13-digit time is generated 1307041488303

Could you tell me how the 13-bit time is generated for the 1307041488303 http://tieba.baidu.com/tb/poptipconfig.js? T = 1307041488303 t = 1307041488303 found that many websites use 13-digit positive numbers to represent the current time & nbsp; this number is increasing. could you tell me the 13-digit time? how is the 13-digit time generated by 1307041488303?
Http://tieba.baidu.com/tb/poptipconfig.js? T = 1307041488303

T = 1307041488303

Many websites use 13-digit positive numbers to indicate the current time.

How is the 13-bit time generated?
------ Solution --------------------

// UNIX timestamp
Echo time ();

Http://cn.php.net/manual/zh/function.time.php
------ Solution --------------------
Js generates 13 bits.
------ Solution --------------------
Js
Alert (new Date (). getTime ());