Originally Posted by
SumairB The new calendar has been pretty good for me until this week, I discovered a major problem. The live tile does not update immediately. It's still showing yesterday's date and appointments!
I had that same darn problem (multiple times). Last I had it was yesterday. Not sure if this was the root cause, but I realized that a few minutes before noticing this problem, I had turned notifications for the ABC News app and had enabled it to run in the background (for headlines on its live tile). Now I'm not sure if this caused the calendar to malfunction or if it was just sheer coincidence, but as soon as I disabled notifications for this app and disabled it from running in the background, the problem was fixed. Note that I had tried several other things before doing this (opening and refreshing the calendar app, unpinning and re-pinning it's tile, restarting the phone), none of which helped.
Did you recently install any app that runs in the background and/or has notifications enabled? I'd try disabling those.