diff --git a/lib/foreman_tasks/cleaner.rb b/lib/foreman_tasks/cleaner.rb
index 00cce03ee..42711b72e 100644
--- a/lib/foreman_tasks/cleaner.rb
+++ b/lib/foreman_tasks/cleaner.rb
@@ -252,7 +252,7 @@ def orphaned_dynflow_tasks
 
     def prepare_filter
       filter_parts = [filter]
-      filter_parts << %(started_at < "#{after.ago.to_s(:db)}") if after > 0
+      filter_parts << %(started_at < "#{after.ago.to_fs(:db)}") if after > 0
       filter_parts << "state ^ (#{states.join(',')})" if states.any?
       filter_parts.select(&:present?).map { |segment| "(#{segment})" }.join(' AND ')
     end
diff --git a/lib/foreman_tasks/tasks/export_tasks.rake b/lib/foreman_tasks/tasks/export_tasks.rake
index 94437b44f..b6565ca16 100644
--- a/lib/foreman_tasks/tasks/export_tasks.rake
+++ b/lib/foreman_tasks/tasks/export_tasks.rake
@@ -310,15 +310,15 @@ namespace :foreman_tasks do
     SKIP_ERRORS = ['true', '1', 'y', 'yes'].include? (ENV['SKIP_FAILED'] || '').downcase
 
     filter = if ENV['TASK_SEARCH'].nil? && ENV['TASK_DAYS'].nil?
-               "started_at > \"#{7.days.ago.to_s(:db)}\" || " \
-                 "(result != success && started_at > \"#{60.days.ago.to_s(:db)})\""
+               "started_at > \"#{7.days.ago.to_fs(:db)}\" || " \
+                 "(result != success && started_at > \"#{60.days.ago.to_fs(:db)})\""
              else
                ENV['TASK_SEARCH'] || ''
              end
 
     if (days = ENV['TASK_DAYS'])
       filter += ' && ' unless filter == ''
-      filter += "started_at > \"#{days.to_i.days.ago.to_s(:db)}\""
+      filter += "started_at > \"#{days.to_i.days.ago.to_fs(:db)}\""
     end
 
     format = ENV['TASK_FORMAT'] || 'html'