You can see when a task was created, and its last update right in your task window in Dart. This information is not in a task by default, so you will have to activate them in the properties section.

To set "created" and "last updated" as defaults in your tasks, go to:

Settings > Properties

And then click on each to reveal them in tasks:

You will be able to see these details under the activity section at the bottom right of your task window: