diff --git a/src/applications/feed/query/PhabricatorFeedQuery.php b/src/applications/feed/query/PhabricatorFeedQuery.php
--- a/src/applications/feed/query/PhabricatorFeedQuery.php
+++ b/src/applications/feed/query/PhabricatorFeedQuery.php
@@ -5,6 +5,8 @@
 
   private $filterPHIDs;
   private $chronologicalKeys;
+  private $rangeMin;
+  private $rangeMax;
 
   public function withFilterPHIDs(array $phids) {
     $this->filterPHIDs = $phids;
@@ -16,6 +18,12 @@
     return $this;
   }
 
+  public function withEpochInRange($range_min, $range_max) {
+    $this->rangeMin = $range_min;
+    $this->rangeMax = $range_max;
+    return $this;
+  }
+
   public function newResultObject() {
     return new PhabricatorFeedStoryData();
   }
@@ -74,6 +82,24 @@
         implode(', ', $keys));
     }
 
+    // NOTE: We may not have 64-bit PHP, so do the shifts in MySQL instead.
+    // From EXPLAIN, it appears like MySQL is smart enough to compute the
+    // result and make use of keys to execute the query.
+
+    if ($this->rangeMin !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'ref.chronologicalKey >= (%d << 32)',
+        $this->rangeMin);
+    }
+
+    if ($this->rangeMax !== null) {
+      $where[] = qsprintf(
+        $conn,
+        'ref.chronologicalKey < (%d << 32)',
+        $this->rangeMax);
+    }
+
     return $where;
   }
 
diff --git a/src/applications/feed/query/PhabricatorFeedSearchEngine.php b/src/applications/feed/query/PhabricatorFeedSearchEngine.php
--- a/src/applications/feed/query/PhabricatorFeedSearchEngine.php
+++ b/src/applications/feed/query/PhabricatorFeedSearchEngine.php
@@ -27,6 +27,12 @@
       id(new PhabricatorProjectSearchField())
         ->setLabel(pht('Include Projects'))
         ->setKey('projectPHIDs'),
+      id(new PhabricatorSearchDateControlField())
+        ->setLabel(pht('Occurs After'))
+        ->setKey('rangeStart'),
+      id(new PhabricatorSearchDateControlField())
+        ->setLabel(pht('Occurs Before'))
+        ->setKey('rangeEnd'),
 
       // NOTE: This is a legacy field retained only for backward
       // compatibility. Users can now run an equivalent query by searching for
@@ -68,6 +74,12 @@
       $query->withFilterPHIDs($phids);
     }
 
+    $range_min = $map['rangeStart']->getEpoch();
+    $range_max = $map['rangeEnd']->getEpoch();
+    if ($range_min || $range_max) {
+      $query->withEpochInRange($range_min, $range_max);
+    }
+
     return $query;
   }