diff --git a/docs/user/dashboard/url-drilldown.asciidoc b/docs/user/dashboard/url-drilldown.asciidoc
index ad3dd17fcfa11..7a092b4686e2d 100644
--- a/docs/user/dashboard/url-drilldown.asciidoc
+++ b/docs/user/dashboard/url-drilldown.asciidoc
@@ -256,7 +256,7 @@ Note:
 | *Range selection*
 | event.from +
 event.to
-| `from` and `to` values of selected range. Depending on your data, could be either a date or number. +
+| `from` and `to` values of the selected range as numbers. +
 Tip: Consider using <<helpers, date>> helper for date formatting.
 
 |
diff --git a/src/plugins/vis_type_vislib/public/vislib/lib/handler.js b/src/plugins/vis_type_vislib/public/vislib/lib/handler.js
index 63eca14707372..f3201f60007f0 100644
--- a/src/plugins/vis_type_vislib/public/vislib/lib/handler.js
+++ b/src/plugins/vis_type_vislib/public/vislib/lib/handler.js
@@ -27,8 +27,8 @@ const markdownIt = new MarkdownIt({
   linkify: true,
 });
 
-const convertToTimestamp = (dateString) => {
-  return parseInt(moment(dateString).format('x'));
+const convertToTimestamp = (date) => {
+  return parseInt(moment(date).format('x'));
 };
 
 /**