diff --git a/src/include/utime.h b/src/include/utime.h
index 732eaebcdff..bb23df52d1d 100644
--- a/src/include/utime.h
+++ b/src/include/utime.h
@@ -171,6 +171,17 @@ public:
     return utime_t(tt, 0);
   }
 
+  utime_t round_to_day() {
+    struct tm bdt;
+    time_t tt = sec();
+    localtime_r(&tt, &bdt);
+    bdt.tm_sec = 0;
+    bdt.tm_min = 0;
+    bdt.tm_hour = 0;
+    tt = mktime(&bdt);
+    return utime_t(tt, 0);
+  }
+
   // cast to double
   operator double() const {
     return (double)sec() + ((double)nsec() / 1000000000.0L);
diff --git a/src/rgw/rgw_lc.cc b/src/rgw/rgw_lc.cc
index cdcfaffff77..7030f7ff01e 100644
--- a/src/rgw/rgw_lc.cc
+++ b/src/rgw/rgw_lc.cc
@@ -244,16 +244,20 @@ int RGWLC::bucket_lc_prepare(int index)
   return 0;
 }
 
-bool RGWLC::obj_has_expired(double timediff, int days)
+bool RGWLC::obj_has_expired(ceph::real_time mtime, int days)
 {
-  double cmp;
+  double timediff, cmp;
+  utime_t base_time;
   if (cct->_conf->rgw_lc_debug_interval <= 0) {
     /* Normal case, run properly */
     cmp = days*24*60*60;
+    base_time = ceph_clock_now().round_to_day();
   } else {
     /* We're in debug mode; Treat each rgw_lc_debug_interval seconds as a day */
     cmp = days*cct->_conf->rgw_lc_debug_interval;
+    base_time = ceph_clock_now();
   }
+  timediff = base_time - ceph::real_clock::to_time_t(mtime);
 
   return (timediff >= cmp);
 }
@@ -298,9 +302,8 @@ int RGWLC::handle_multipart_expiration(RGWRados::Bucket *target, const map<strin
           return ret;
       }
 
-      utime_t now = ceph_clock_now();
       for (auto obj_iter = objs.begin(); obj_iter != objs.end(); ++obj_iter) {
-        if (obj_has_expired(now - ceph::real_clock::to_time_t(obj_iter->meta.mtime), prefix_iter->second.mp_expiration)) {
+        if (obj_has_expired(obj_iter->meta.mtime, prefix_iter->second.mp_expiration)) {
           rgw_obj_key key(obj_iter->key);
           if (!mp_obj.from_meta(key.name)) {
             continue;
@@ -384,7 +387,6 @@ int RGWLC::bucket_lc_process(string& shard_id)
           return ret;
         }
         
-        utime_t now = ceph_clock_now();
         bool is_expired;
         for (auto obj_iter = objs.begin(); obj_iter != objs.end(); ++obj_iter) {
           rgw_obj_key key(obj_iter->key);
@@ -396,7 +398,7 @@ int RGWLC::bucket_lc_process(string& shard_id)
             //we have checked it before
             is_expired = true;
           } else {
-            is_expired = obj_has_expired(now - ceph::real_clock::to_time_t(obj_iter->meta.mtime), prefix_iter->second.expiration);
+            is_expired = obj_has_expired(obj_iter->meta.mtime, prefix_iter->second.expiration);
           }
           if (is_expired) {
             RGWObjectCtx rctx(store);
@@ -450,7 +452,6 @@ int RGWLC::bucket_lc_process(string& shard_id)
           return ret;
         }
 
-        utime_t now = ceph_clock_now();
         ceph::real_time mtime;
         bool remove_indeed = true;
         int expiration;
@@ -485,9 +486,9 @@ int RGWLC::bucket_lc_process(string& shard_id)
               continue;
             } else if (!skip_expiration) {
               if (expiration > 0) {
-                is_expired = obj_has_expired(now - ceph::real_clock::to_time_t(mtime), expiration);
+                is_expired = obj_has_expired(mtime, expiration);
               } else {
-                is_expired = now >= ceph::real_clock::to_time_t(*prefix_iter->second.expiration_date);
+                is_expired = ceph_clock_now() >= ceph::real_clock::to_time_t(*prefix_iter->second.expiration_date);
               }
             }
           } else {
@@ -497,7 +498,7 @@ int RGWLC::bucket_lc_process(string& shard_id)
             remove_indeed = true;
             mtime = (obj_iter == objs.begin())?pre_obj.meta.mtime:(obj_iter - 1)->meta.mtime;
             expiration = prefix_iter->second.noncur_expiration;
-            is_expired = obj_has_expired(now - ceph::real_clock::to_time_t(mtime), expiration);
+            is_expired = obj_has_expired(mtime, expiration);
           }
           if (skip_expiration || is_expired) {
             if (obj_iter->is_visible()) {
diff --git a/src/rgw/rgw_lc.h b/src/rgw/rgw_lc.h
index 0a655c5c3e3..4d7b670bea3 100644
--- a/src/rgw/rgw_lc.h
+++ b/src/rgw/rgw_lc.h
@@ -363,7 +363,7 @@ class RGWLC {
 
   private:
   int remove_expired_obj(RGWBucketInfo& bucket_info, rgw_obj_key obj_key, bool remove_indeed = true);
-  bool obj_has_expired(double timediff, int days);
+  bool obj_has_expired(ceph::real_time mtime, int days);
   int handle_multipart_expiration(RGWRados::Bucket *target, const map<string, lc_op>& prefix_map);
 };