in preAddToEdit()
//This screen is called again with Client PC Local Timezone in aaa or bbb fetched thru $_GET['aaa']  , $_GET['bbb]   
// URL on reloading looks like below
//http://localhost/visualaid/index.php?atknodetype=requests.requester&atkaction=edit&atkselector=requester.id%3D%271%27&atklevel=-1&atkprevlevel=0&aaa=Wed%20Nov%2014%202018%2009:14:27%20GMT+0530%20(India%20Standard%20Time)&bbb=-330
//There is a session variable used to manage that it is called only ONCE and does NOT get into a loop

                // javescript date() is User/Client PC date in format=Thu Nov 08 2018 20:37:22 GMT 0545 (Nepal Time)
                $script = "setTimeout(function(){ window.location.href = window.location.href+'aaa='+Date()+'&bbb='+(new Date()).getTimezoneOffset(); }, 10);"; //10 millisseconds just for the sec
             $page = &$this->getPage();     //following java-scripts already registered in constructor
             $page->register_loadscript($script);