Question:

What kind of data do the timestamp fields capture on the Call object in CRM?

Answer:

• Signature_Timestamp_vod__c: Device up-time in seconds, at the time the signature was captured.
• Submit_Timestamp_vod__c: Device up-time in seconds, at the time the Submit button was pressed.
• Check_In_Timestamp_vod__c: Device up-time in seconds, when the Check-In button is pressed (zvod_Check_In_vod field on the layout).

Related Documentation:

CRM Help Documentation: 

• Call Reporting Overview

KB Article:

• Why Does the Check-in and Submit Timestamp Fields Display Numbers Instead of Dates in CRM?