Commit 9a72aee

@@ -19,6 +19,10 @@ module Scim
         value = tree[:value].to_s[1..-2]
         value = DateTime.parse(value)
         User.where("#{attr} > ?", value)
+      when 'lt'
+        value = tree[:value].to_s[1..-2]
+        value = DateTime.parse(value)
+        User.where("#{attr} < ?", value)
       else
         User.none
       end

@@ -53,6 +53,14 @@ RSpec.describe User do
       expect(results).to match_array([random_user])
     end
 
+    specify do
+      freeze_time
+      random_user.update!(updated_at: 10.minutes.from_now)
+
+      results = User.scim_filter_for(tree_for("meta.lastModified lt \"#{Time.now.iso8601}\""))
+      expect(results).to match_array(users - [random_user])
+    end
+
     specify do
       first_user = users.sample
       second_user = users.sample