get submitTime from external clock

[JamesPHoughton]

Currently using the client's local clock to populate a submitTime field in the record object:

const record = { 
                surveySource: packageJson["name"],
                surveyVersion: packageJson["version"],
                surveyName, 
                responses, 
                result,
                submitTime: Date.now()
            }

This isn't robust to errors in the user's clock. Have a separate field that gets time from an external server if it can and submits that as well, if it can:

const record = { 
                surveySource: packageJson["name"],
                surveyVersion: packageJson["version"],
                surveyName, 
                responses, 
                result,
                userSubmitTime: Date.now(),
                universalSubmitTime: {<some service?> || "not available"}
            }

[JamesPHoughton]

not using submitTime, just recording elapsed time.