diff --git a/resources/sql/autopatches/20140317.mupdatedkey.sql b/resources/sql/autopatches/20140317.mupdatedkey.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20140317.mupdatedkey.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_maniphest.maniphest_task
+  ADD KEY `key_dateModified` (dateModified);
diff --git a/src/applications/maniphest/query/ManiphestTaskQuery.php b/src/applications/maniphest/query/ManiphestTaskQuery.php
--- a/src/applications/maniphest/query/ManiphestTaskQuery.php
+++ b/src/applications/maniphest/query/ManiphestTaskQuery.php
@@ -22,6 +22,8 @@
   private $includeNoProject    = null;
   private $dateCreatedAfter;
   private $dateCreatedBefore;
+  private $dateModifiedAfter;
+  private $dateModifiedBefore;
 
   private $fullTextSearch   = '';
 
@@ -153,6 +155,16 @@
     return $this;
   }
 
+  public function withDateModifiedBefore($date_modified_before) {
+    $this->dateModifiedBefore = $date_modified_before;
+    return $this;
+  }
+
+  public function withDateModifiedAfter($date_modified_after) {
+    $this->dateModifiedAfter = $date_modified_after;
+    return $this;
+  }
+
   public function loadPage() {
 
     // TODO: (T603) It is possible for a user to find the PHID of a project
@@ -193,6 +205,20 @@
         $this->dateCreatedBefore);
     }
 
+    if ($this->dateModifiedAfter) {
+      $where[] = qsprintf(
+        $conn,
+        'dateModified >= %d',
+        $this->dateModifiedAfter);
+    }
+
+    if ($this->dateModifiedBefore) {
+      $where[] = qsprintf(
+        $conn,
+        'dateModified <= %d',
+        $this->dateModifiedBefore);
+    }
+
     $where[] = $this->buildPagingClause($conn);
 
     $where = $this->formatWhereClause($where);
diff --git a/src/applications/maniphest/query/ManiphestTaskSearchEngine.php b/src/applications/maniphest/query/ManiphestTaskSearchEngine.php
--- a/src/applications/maniphest/query/ManiphestTaskSearchEngine.php
+++ b/src/applications/maniphest/query/ManiphestTaskSearchEngine.php
@@ -64,6 +64,8 @@
 
     $saved->setParameter('createdStart', $request->getStr('createdStart'));
     $saved->setParameter('createdEnd', $request->getStr('createdEnd'));
+    $saved->setParameter('modifiedStart', $request->getStr('modifiedStart'));
+    $saved->setParameter('modifiedEnd', $request->getStr('modifiedEnd'));
 
     $limit = $request->getInt('limit');
     if ($limit > 0) {
@@ -170,6 +172,17 @@
       $query->withDateCreatedBefore($end);
     }
 
+    $mod_start = $this->parseDateTime($saved->getParameter('modifiedStart'));
+    $mod_end = $this->parseDateTime($saved->getParameter('modifiedEnd'));
+
+    if ($mod_start) {
+      $query->withDateModifiedAfter($mod_start);
+    }
+
+    if ($mod_end) {
+      $query->withDateModifiedBefore($mod_end);
+    }
+
     $this->applyCustomFieldsToQuery($query, $saved);
 
     return $query;
@@ -344,6 +357,14 @@
       'createdEnd',
       pht('Created Before'));
 
+    $this->buildDateRange(
+      $form,
+      $saved,
+      'modifiedStart',
+      pht('Updated After'),
+      'modifiedEnd',
+      pht('Updated Before'));
+
     $form
       ->appendChild(
         id(new AphrontFormTextControl())