Your earnings history is available to be viewed from within the Earn > Summary page of the application. This page will show your Current Balance, your Lifetime Balance, your Total XP, as well as a breakdown of your earnings over the last 24 hours, last 7 days, and last 30 days respectively.
Below this, is an earnings history graph. This will show a breakdown of your earnings over the past 24 hours, 7 days, or 30 days depending which filter you select. When you hover over each of these bars on the graph, it will list the balance earned, and the time in which it was earned. Note that when on the 30 days breakdown, this will show the Date (in Month/Date format), and then whether it was AM or PM.
You can also click and drag over a number of bars, and it will show a total earned in the selected period of time. This works on all three filters.