snmpStorageGlobErrorTime records the date and time when snmpStorageGlobError was last updated, per its description, returning an all-zero value if no error has occurred since initialization. An admin uses this timestamp to know how recent a reported global storage error is, which matters when deciding whether it's still relevant to a current troubleshooting session. For example, an admin would ignore a snmpStorageGlobError message whose snmpStorageGlobErrorTime is from weeks ago, since a more recent successful write has likely occurred since.