I tried to use the tab "Internet time" after clicking on the clock to select "Adjust Date / Time". When I selected the server "time.windows.com", then clicked "update now" on the right. Ok, error came! I got an error message "An error occurred while Windows was synchronizing with time.windows.com". Great, then I tried it with other time servers. Nothing different.
How to fix this up? Here are some steps I found in the internet.
1. Press Winkey+R, or select "Run..." from the start menu, and type "cmd" in the box;
2. After the command window shows up, type the following commands:
net stop w32time
w32tm /unregister [ignore error message]
w32tm /unregister [enter a second time]
reg add hklm\system\currentcontrolset\services\w32time\parameters\ /v NtpServer /t reg_sz /d time.nist.gov /f
net start w32time
3. Try the "Internet time" update again. It should work now.