Comment 2 for bug 1456366

This data is tracked by Ubuntu App Launch as each application is paused and resumed even. If you look at ubuntu-app-usage you just need to change the query there to be today instead of all time. You can also, probably most usefully, query most likely to use today instead of most used.

Link to the code: http://bazaar.launchpad.net/~indicator-applet-developers/ubuntu-app-launch/trunk.15.10/view/head:/tools/ubuntu-app-usage.c