How to unlock the new time application in Win10 preview version 9901

After the Win10 preview version 9901 leaked, the user was pleasantly surprised to discover the new time application, including the clock, calendar and world time. The interface presented a new atmosphere and was very angry. How to unlock the new time application form?
This time app brings Windows 10 and Windows Phone closer and closer, thanks to an application from the WP App Store. It's not hard to see that the design of this app is still in Modern style, which shows that Microsoft has found a good way to get Windows and WP together.
This unlock involves a registry modification, so please back up the registry before proceeding.
Unlock method

1. Enter regedit in the start menu search bar or run and press Enter to open the registry editor
2. Navigate to
HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\ CurrentVersion\\ImmersiveShell\\

3. Right click on the right margin to create a DWORD key, rename it to UseWin32TrayClockExperience, and double-click to set its value data to 0 (default is 0). At this point, the new time app effect will take effect. If the UseWin32TrayClockExperience key already exists in the registry, change its value data to 0.

4, if you want to change back to the default settings, change the UseWin32TrayClockExperience key value to 1.
Other Features
The new time app includes an alarm clock app that allows users to set alarms for multiple world clock conditions. But there is a small problem here, that is, regardless of the new time application itself or the alarm clock, it may fail every time it is loaded or it takes a minute to load.
Unlocking the new time app by modifying the registry method, you can use this function for more time tools. However, the Win10 preview version of the 9901 version is not as publicly tested as 9879, and everyone should be cautious.