In Windows, Symantec Endpoint Protection uses the following registry key to store information about the last time a virus scan was completed:
64bit operating system:
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec Endpoint Protection\CurrentVersion\public-opstate]
32bit operating system:
[HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\CurrentVersion\public-opstate]
Upon checking registry, above entry may not exist.
This registry entry, along with relevant value, is only created after completing first scan.
Symantec Endpoint Protection on Windows OS
Run and complete Active Scan / Full Scan to see the entry being created and populated with date / time value.