diff --git a/lib/validates_timeliness/converter.rb b/lib/validates_timeliness/converter.rb
index 3b84ec9..4317ee1 100644
--- a/lib/validates_timeliness/converter.rb
+++ b/lib/validates_timeliness/converter.rb
@@ -10,7 +10,7 @@ def initialize(type:, format: nil, ignore_usec: false, time_zone_aware: false)
     end
 
     def type_cast_value(value)
-      return nil if value.nil? || !value.respond_to?(:to_time)
+      return nil if value.nil? || !value.respond_to?(:to_time) || value.is_a?(Numeric)
 
       value = value.in_time_zone if value.acts_like?(:time) && time_zone_aware?
       value = case type