diff --git a/lib/zuora/validations.rb b/lib/zuora/validations.rb
index 647fdbb..fa31f8e 100644
--- a/lib/zuora/validations.rb
+++ b/lib/zuora/validations.rb
@@ -8,16 +8,16 @@ def self.included(base)
 
     class DateTimeValidator < ActiveModel::EachValidator
       def validate_each(record, attribute, value)
-        unless value.is_a?(Date)
-          record.errors[attribute] << (options[:message] || "is not a valid datetime")
+        unless [DateTime, Time].any? { |klass| value.is_a?(klass) }
+        record.errors.add(attribute, (options[:message] || "is not a valid datetime"))
         end
       end
     end
 
     class DateValidator < ActiveModel::EachValidator
       def validate_each(record, attribute, value)
-        unless value.is_a?(Date)
-          record.errors[attribute] << (options[:message] || "is not a valid date")
+        unless [Date].any? { |klass| value.is_a?(klass) }
+          record.errors.add(attribute, (options[:message] || "is not a valid date"))
         end
       end
     end
@@ -38,4 +38,4 @@ def validates_date_of(*attr_names)
       end
     end
   end
-end
+end
\ No newline at end of file
diff --git a/spec/zuora/validations_spec.rb b/spec/zuora/validations_spec.rb
index f6c34ca..a202f05 100644
--- a/spec/zuora/validations_spec.rb
+++ b/spec/zuora/validations_spec.rb
@@ -34,8 +34,8 @@ class ExampleObject
 
   describe "validating date_time" do
     it "allows date and time related objects" do
-      [Date.today, DateTime.now, Time.now].each do |val|
-        @obj.validated_at = Date.today
+      [DateTime.now, Time.now].each do |val|
+        @obj.validated_at = val
         @obj.valid?
         @obj.errors[:validated_at].should be_blank
       end