diff --git a/weed/mq/sub_coordinator/consumer_group.go b/weed/mq/sub_coordinator/consumer_group.go
index 9b62f616e..a1279c204 100644
--- a/weed/mq/sub_coordinator/consumer_group.go
+++ b/weed/mq/sub_coordinator/consumer_group.go
@@ -71,8 +71,6 @@ func (cg *ConsumerGroup) OnPartitionListChange(assignments []*mq_pb.BrokerPartit
 func (cg *ConsumerGroup) RebalanceConsumberGroupInstances(knownPartitionSlotToBrokerList *pub_balancer.PartitionSlotToBrokerList, reason string) {
 	glog.V(0).Infof("rebalance consumer group %s due to %s", cg.topic.String(), reason)
 
-	now := time.Now().UnixNano()
-
 	// collect current topic partitions
 	partitionSlotToBrokerList := knownPartitionSlotToBrokerList
 	if partitionSlotToBrokerList == nil {
@@ -104,7 +102,7 @@ func (cg *ConsumerGroup) RebalanceConsumberGroupInstances(knownPartitionSlotToBr
 		if !found {
 			partitionSlots = make([]*PartitionSlotToConsumerInstance, 0)
 		}
-		consumerGroupInstance.Partitions = ToPartitions(partitionSlotToBrokerList.RingSize, partitionSlots, now)
+		consumerGroupInstance.Partitions = ToPartitions(partitionSlotToBrokerList.RingSize, partitionSlots)
 		assignedPartitions := make([]*mq_pb.SubscriberToSubCoordinatorResponse_AssignedPartition, len(partitionSlots))
 		for i, partitionSlot := range partitionSlots {
 			assignedPartitions[i] = &mq_pb.SubscriberToSubCoordinatorResponse_AssignedPartition{
@@ -112,7 +110,7 @@ func (cg *ConsumerGroup) RebalanceConsumberGroupInstances(knownPartitionSlotToBr
 					RangeStop: partitionSlot.RangeStop,
 					RangeStart: partitionSlot.RangeStart,
 					RingSize: partitionSlotToBrokerList.RingSize,
-					UnixTimeNs: now,
+					UnixTimeNs: partitionSlot.UnixTimeNs,
 				},
 				Broker: partitionSlot.Broker,
 			}
diff --git a/weed/mq/sub_coordinator/partition_list.go b/weed/mq/sub_coordinator/partition_list.go
index 7f02253f6..fa0e3761f 100644
--- a/weed/mq/sub_coordinator/partition_list.go
+++ b/weed/mq/sub_coordinator/partition_list.go
@@ -23,10 +23,10 @@ func NewPartitionSlotToConsumerInstanceList(ringSize int32, version int64) *Part
 	}
 }
 
-func ToPartitions(ringSize int32, slots []*PartitionSlotToConsumerInstance, unixTimeNs int64) []*topic.Partition {
+func ToPartitions(ringSize int32, slots []*PartitionSlotToConsumerInstance) []*topic.Partition {
 	partitions := make([]*topic.Partition, 0, len(slots))
 	for _, slot := range slots {
-		partitions = append(partitions, topic.NewPartition(slot.RangeStart, slot.RangeStop, ringSize, unixTimeNs))
+		partitions = append(partitions, topic.NewPartition(slot.RangeStart, slot.RangeStop, ringSize, slot.UnixTimeNs))
 	}
 	return partitions
 }