Get INSERT/UPDATE/DELETE statements executed at specified time
If there is no auditing enabled to capture CDC(Change Data Capture) and no trigger defined on Insert/Update/Delete statement then, I don't think its possible to get details.

If you enable them now then, you would be able to capture them in the future. There are tonnes of article on how to configure auditing over SQL server. Full recovery can only help you in restoring database upto a specified point in time however that again depends how frequently you are taking log backup.

Hope above helps.