OnTheClock offers several different methods of sorting through your time cards. On your "Time Cards" page, if you don't already see these additional filtering options, you should see a blue link (shown below) that says "Click For More Options." Click that. =)
Now you should be able to see these filters for sorting your time card data.
Sorting by Employee (Emp), Department (Dept), Manager (Mgr), and Job, are all fairly self-explanatory, and work as you would expect. Sorting by Department Worked (Dept Wrkd) will show any shifts worked by an employee with "department transferring" enabled (this is more of a specialized type of search–if you don't use department transferring than you can ignore it) that have chosen a department upon clocking in. Using the Custom search filter allows you to enter a range of up to 3 months at a time. This will cause any overtime to be recalculated based on your newly filtered dates, so be aware of that.
Sorting by Dates will always give you a set of pay period start dates and pay period end dates. This is helpful for seeing a custom range and keeping your OT in tact.