Vivo mobile phone doesn't have an old almanac.

Vivo mobile phone does not display holidays, so you can try to solve this problem in the following ways:

You can try to run the calendar in the background first, then connect to the WiFi network and wait for a while to see if there will be any updates.

You can also try to connect to other WiFi networks or data networks in your phone, and then restart your phone to check.

If the above scheme has not been updated, you can adjust the system time after one day in Settings-More Settings-Date and Time of your mobile phone, and then use the above scheme to operate. After updating the calendar leave/shift information, set the system time back to the accurate calendar for viewing.

If this phenomenon still occurs, it is recommended to try to find the calendar clearing data in phone settings-more settings-application.