diff --git a/storage/bucket.go b/storage/bucket.go
index 478482645fab..ec34c9af4c6b 100644
--- a/storage/bucket.go
+++ b/storage/bucket.go
@@ -455,6 +455,10 @@ type LifecycleCondition struct {
 	// the specified date in UTC.
 	CreatedBefore time.Time
 
+	// DaysSinceNoncurrentTime is the days elapsed since the noncurrent timestamp
+	// of the object. This condition is relevant only for versioned objects.
+	DaysSinceNoncurrentTime int64
+
 	// Liveness specifies the object's liveness. Relevant only for versioned objects
 	Liveness Liveness
 
@@ -464,6 +468,10 @@ type LifecycleCondition struct {
 	// Values include "STANDARD", "NEARLINE", "COLDLINE" and "ARCHIVE".
 	MatchesStorageClasses []string
 
+	// NoncurrentTimeBefore is the noncurrent timestamp of the object. This
+	// condition is relevant only for versioned objects.
+	NoncurrentTimeBefore time.Time
+
 	// NumNewerVersions is the condition matching objects with a number of newer versions.
 	//
 	// If the value is N, this condition is satisfied when there are at least N
@@ -946,9 +954,10 @@ func toRawLifecycle(l Lifecycle) *raw.BucketLifecycle {
 				StorageClass: r.Action.StorageClass,
 			},
 			Condition: &raw.BucketLifecycleRuleCondition{
-				Age:                 r.Condition.AgeInDays,
-				MatchesStorageClass: r.Condition.MatchesStorageClasses,
-				NumNewerVersions:    r.Condition.NumNewerVersions,
+				Age:                     r.Condition.AgeInDays,
+				DaysSinceNoncurrentTime: r.Condition.DaysSinceNoncurrentTime,
+				MatchesStorageClass:     r.Condition.MatchesStorageClasses,
+				NumNewerVersions:        r.Condition.NumNewerVersions,
 			},
 		}
 
@@ -964,6 +973,9 @@ func toRawLifecycle(l Lifecycle) *raw.BucketLifecycle {
 		if !r.Condition.CreatedBefore.IsZero() {
 			rr.Condition.CreatedBefore = r.Condition.CreatedBefore.Format(rfc3339Date)
 		}
+		if !r.Condition.NoncurrentTimeBefore.IsZero() {
+			rr.Condition.NoncurrentTimeBefore = r.Condition.NoncurrentTimeBefore.Format(rfc3339Date)
+		}
 		rl.Rule = append(rl.Rule, rr)
 	}
 	return &rl
@@ -981,9 +993,10 @@ func toLifecycle(rl *raw.BucketLifecycle) Lifecycle {
 				StorageClass: rr.Action.StorageClass,
 			},
 			Condition: LifecycleCondition{
-				AgeInDays:             rr.Condition.Age,
-				MatchesStorageClasses: rr.Condition.MatchesStorageClass,
-				NumNewerVersions:      rr.Condition.NumNewerVersions,
+				AgeInDays:               rr.Condition.Age,
+				DaysSinceNoncurrentTime: rr.Condition.DaysSinceNoncurrentTime,
+				MatchesStorageClasses:   rr.Condition.MatchesStorageClass,
+				NumNewerVersions:        rr.Condition.NumNewerVersions,
 			},
 		}
 
@@ -998,6 +1011,9 @@ func toLifecycle(rl *raw.BucketLifecycle) Lifecycle {
 		if rr.Condition.CreatedBefore != "" {
 			r.Condition.CreatedBefore, _ = time.Parse(rfc3339Date, rr.Condition.CreatedBefore)
 		}
+		if rr.Condition.NoncurrentTimeBefore != "" {
+			r.Condition.NoncurrentTimeBefore, _ = time.Parse(rfc3339Date, rr.Condition.NoncurrentTimeBefore)
+		}
 		l.Rules = append(l.Rules, r)
 	}
 	return l
diff --git a/storage/bucket_test.go b/storage/bucket_test.go
index e1bddda3eef3..7293a35046b3 100644
--- a/storage/bucket_test.go
+++ b/storage/bucket_test.go
@@ -76,11 +76,11 @@ func TestBucketAttrsToRawBucket(t *testing.T) {
 					Type: DeleteAction,
 				},
 				Condition: LifecycleCondition{
-					AgeInDays:             30,
-					Liveness:              Live,
-					CreatedBefore:         time.Date(2017, 1, 2, 3, 4, 5, 6, time.UTC),
-					MatchesStorageClasses: []string{"NEARLINE"},
-					NumNewerVersions:      10,
+					DaysSinceNoncurrentTime: 30,
+					Liveness:                Live,
+					NoncurrentTimeBefore:    time.Date(2017, 1, 2, 3, 4, 5, 6, time.UTC),
+					MatchesStorageClasses:   []string{"NEARLINE"},
+					NumNewerVersions:        10,
 				},
 			}, {
 				Action: LifecycleAction{
@@ -142,11 +142,11 @@ func TestBucketAttrsToRawBucket(t *testing.T) {
 					Type: DeleteAction,
 				},
 				Condition: &raw.BucketLifecycleRuleCondition{
-					Age:                 30,
-					IsLive:              googleapi.Bool(true),
-					CreatedBefore:       "2017-01-02",
-					MatchesStorageClass: []string{"NEARLINE"},
-					NumNewerVersions:    10,
+					DaysSinceNoncurrentTime: 30,
+					IsLive:                  googleapi.Bool(true),
+					NoncurrentTimeBefore:    "2017-01-02",
+					MatchesStorageClass:     []string{"NEARLINE"},
+					NumNewerVersions:        10,
 				},
 			}, {
 				Action: &raw.BucketLifecycleRuleAction{