I'm basically working on an alarm app, where at certain times (e.g. 7pm, 10:30am), Glass should alert the user. I think this will work by creating a live card, but I don't know how to create one at a certain time and I can't find anything online about dealing with this. Any ideas?
You can look at the Timer GDK sample project on the Google Glass GitHub repository.
To give it more alarm functionality, you can use the Calendar class (java.util.Calendar).