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