Is there any way to create a timesheet and calculate hours worked?

If you need a simple single day time sheet, you could set this up using two time fields and a calculation field:

https://www.jotform.com/help/259-How-to-perform-calculation-in-the-form

Once the fields are added, set up the calculation for the calculation field as Time out minus Time in:

Here is the resulting form:

https://form.jotformpro.com/72267426152960

You can clone it to your own account if you would like:

https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL

If you have any further questions, let us know and we will be happy to help.