diff --git a/lib/tasks/doi.rake b/lib/tasks/doi.rake
index be3ce1cb1..6640f772e 100644
--- a/lib/tasks/doi.rake
+++ b/lib/tasks/doi.rake
@@ -60,7 +60,7 @@ namespace :doi do
       until_date = ENV['UNTIL_DATE'] || Date.current.strftime("%F")
     end
 
-    index_time = Time.zone.now.utc.iso8601
+    index_time = ENV['INDEX_TIME'] || Time.zone.now.utc.iso8601
 
     Doi.index(from_date: from_date, until_date: until_date, index_time: index_time)
   end