If your clock has lost its time server- your not alone. The default time server apparently went out of business:
http://time-zone-server.scapp.io/getTime/America/Phoenix is no longer accessible and will produce an error :404 in the time according to server section of the summary tab for your clock
Easy Fix. Just replace the time server url with the appropriate one below:
http://its.internet-box.ch/getTime/America/Phoenix for Arizona customers
http://its.internet-box.ch/getTime/America/Denver for MST
http://its.internet-box.ch/getTime/America/Los_Ang... for PST
http://its.internet-box.ch/getTime/America/Chicago for CST
http://its.internet-box.ch/getTime/America/New_Yor... for EST