var cloud.google.com/go/logging.unixZeroTimestamp

3 uses

	cloud.google.com/go/logging (current package)
		logging.go#L176: var unixZeroTimestamp *tspb.Timestamp
		logging.go#L180: 	unixZeroTimestamp, err = ptypes.TimestampProto(time.Unix(0, 0))
		logging.go#L192: 		Timestamp: unixZeroTimestamp, // Identical timestamps and insert IDs are both