Glance Problem in Windows Phone 8.1 Developer Preview [SOLVED]

Many users have installed Windows Phone 8.1 via Preview for Developer, include me. I have to admit that it's great even it's still in preview. But some users include me experienced a problem about Nokia Glance. They only get clock in their glance screen, and no option to display glance info in setting.

Fortunately, there is a way to solve this problem, here it is:

1. Since we can't uninstall Glance directly, we have to do some safe tricks.
   Change your phone date to 2110
2. Tap Glance in Setting
3. It won't open, and a dialog will appear says that there is a problem.
4. Tap uninstall
5. Reinstall Glance using SysApp Pusher (search in Store)
6. Open Glance setting and you'll get Glance 2.0, like the Glance in Windows Phone 8.0