If employees have to actively submit their time entries in the Core app, how can you see the time at which they submitted the entries? The rationale behind this is that users might want to track the lateness of submissions and also know who submitted to whom.
The date stamp of entry submission can be found in the details of each time entry under the Additional tab > Workflow History section. However, it shows the day when the time entry was submitted, not the exact time. You can also run the Workflow Details report to see who submitted the time entries to whom.