diff --git a/report_mailer.rb b/report_mailer.rb
index 48d8e0e..e2ef47d 100644
--- a/report_mailer.rb
+++ b/report_mailer.rb
@@ -12,6 +12,6 @@ connection_details = YAML::load(File.open('config/database.yml'))
 ActiveRecord::Base.establish_connection(connection_details)
 
 if __FILE__ == $0
-  ReadingsMailer.deliver(Date.today)
+  ReadingsMailer.deliver(Date.today.advance(days: -1))
 end
 #p sync