Yes, you can cancel or call back a submitted time entry as long as it hasn’t already been approved (Approval Status).
Here’s how: go to the Dashboard Tab, Time Activity Sub Tab, and click the round “Submitted” radial button. This will pull up a list of time entries that are “Submitted” Status.
Place a check mark next to the entries that you want to unsubmit. Then click the “Reject” button. This will place those entries back into “Pending” Status.