Time Recording is a free to download time sheet management app that has many extra features that are purchaseable through in app purchases that range from $1.57 - $1.99 per item.
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Pro You can automate tasks using the Tasker plugin
For example, you can create a reminder for yourself that will go off when your device connects to the office wifi.
Pro Android Wear integration
Time Recording has built in Android Wear integration, allowing for even easier check in and check outs by using the watch instead of pulling out the main device.
Pro Easily created projects and tasks
Time Recording allows for easy creation of projects and tasks that can each assign time spent on them by checking in and checking out.
Con Free version has ads
There are advertisements in the free version of the app with the only way to remove them through an in app purchase.