This read-only octet string (0-3 bytes) bit-packs the hour, day of month, month, and two-digit year of when this specific correctable memory error occurred, the same encoding used by cpqHeCriticalErrorTime but scoped to this correctable-memory-error row. An admin decodes this timestamp to see exactly when a particular DIMM socket's correctable error happened, useful for correlating a string of corrections against a specific workload or maintenance event. If several rows for the same memory location show closely spaced decoded times, the admin knows that socket is actively, not just historically, generating errors.