thank you so much for your help Bennett.

The first would be used when describing a the owner of a time sheet. For example, Bob is the gardener and, after he filled out his timesheet, he left it on a table. His boss walks in and asks someone, "what is this?" Another person in the room could answer, "that's the timesheet of the gardener" if he doesn't know Bob's name. The second could be used when describing what the time sheet is. For example, a person is looking to buy some timesheets at a store and goes to an aisle of timesheets. Not knowing one timesheet from another, he asks the saleperson for help. He points at a timesheet and asks what it is. The salesperson might answer "that's the timesheet for a gardener" though, honestly, it sounds a little awkward to me.

Hi Katie :) this is the example: we can say (Time sheet of gardener) or (Time sheet for gardener) Which of these is correct?

i don't understand the context, can you put it in a sentence?

ah sorry I mean the difference between the use "Of" and "For"