GoCanvas allows you to export your submissions. When they are exported you are given more than just the data received from the submission. You can also see other information about the submission, like the form it belongs to, the user who submitted it, the Submission ID, and also the response and device dates/times. Below is an explanation of what the difference between Response Date/Time and Device Date/Time.
When a submission is uploaded after it is finished it is sent to our servers. The response date/time is the time that a submission is received by our servers in UTC.
The device date/time is the time that a submission is completed in UTC. A submission is completed when you hit Done at the end of the form.