Hi Encee,
I understand that you need the calendar app live tile to show today’s birthday notifications.
I suggest you to follow the steps mentioned below and check if it helps.
Method 1: Make sure that the Date and Time settings are correct.
You should make sure that the Date and Time settings are correct on the computer. To do this, follow these steps:
a) Double click on the time and date on the right hand side bottom of your screen.
b) Click on change date and time settings.
c) Click on Internet time and click on change settings.
d) Place a check mark at “Synchronize time with internet server”
e) Click on Apply and Ok.
Method 2: Run the Modern User Interface App troubleshooter and check if it helps.
Step 1:
Please click on the link given, download the file save it and run the troubleshooter:
http://download.microsoft.com/download/F/2/4/F24D0C03-4181-4E5B-A23B-5C3A6B5974E3/apps.diagcab
Step 2: Please go to the link given here and check if the issue gets resolved.
Please go through the following link for troubleshooting.
In many cases, the Windows Store will automatically notify you if there’s a problem with an app and try to fix the problem. If the Store doesn’t notify you of the problem or you continue experiencing problems with an app.
What to do if you have problems with an app:
http://windows.microsoft.com/en-us/windows-8/what-troubleshoot-problems-app
You can also refer to the article mentioned below for more information.
How to manage notifications for Mail, Calendar, People, and Messaging
http://windows.microsoft.com/en-us/windows-8/how-manage-notifications
Calendar app for Windows: FAQs
http://windows.microsoft.com/en-us/windows-8/calendar-faq
If you have any question get back to us, we are happy to help you