This is true. You should be using a background task with a timed event to perform time-specific functions:
http://msdn.microsoft.com/en-us/library/windows/apps/xaml/Hh977059(v=win.10).aspx
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.