Thank you for contacting us.
I am not sure whether I understand you correctly. I assume that you want to show customer's current time without making postback to the server. I could suggest you try to extract the customer's current time using WebServices. Please, let me know If I have misunderstood you. I would like to ask you for more details about the scenario you want to achieve and the way you find customer's current time so that we can get a better idea of your scenario and do our best to help you with this issue.
the Telerik team