To execute the action using the javascript (web api) you can use following code.
var actionObj = {
TimezoneLocation: "New york",
}
// call this function to execute the action
execute(actionObj, "ikl_InogicMaplyticsAPIGetTimeZone()", function (data) {
alert("Success: " + data);
}, function (error) {
debugger;
alert("Error: " + error.message);
});