diff --git a/core/modules/views/src/Plugin/views/query/Sql.php b/core/modules/views/src/Plugin/views/query/Sql.php
index a110af0..8741f20 100644
--- a/core/modules/views/src/Plugin/views/query/Sql.php
+++ b/core/modules/views/src/Plugin/views/query/Sql.php
@@ -1797,7 +1797,15 @@ public function getDateFormat($field, $format) {
           'A' => '',
         );
         $format = strtr($format, $replace);
-        $expression = "strftime('$format', $field, 'unixepoch')";
+        // SQLite does not have a ISO week substitution string, so it needs
+        // special handling.
+        // @see http://stackoverflow.com/a/15511864/1499564
+        if ($format === '%W') {
+          $expression = "((strftime('%j', date(strftime('%Y-%m-%d', $field, 'unixepoch'), '-3 days', 'weekday 4')) - 1) / 7 + 1)";
+        }
+        else {
+          $expression = "strftime('$format', $field, 'unixepoch')";
+        }
         // The expression yields a string, but the comparison value is an
         // integer in case the comparison value is a float, integer, or numeric.
         // All of the above SQLite format tokens only produce integers. However,