#399

backend/app/models/post.rb

@@ -172,6 +172,8 @@ class Post < ApplicationRecord
   private
 
   def validate_original_created_range
+    return if skip_original_created_validation?
+
     f = parse_original_created_value(:original_created_from)
     b = parse_original_created_value(:original_created_before)
     return if f.nil? || b.nil?
@@ -251,4 +253,12 @@ class Post < ApplicationRecord
   def minute_precision_time? value
     value.sec.zero? && value.nsec.zero?
   end
+
+  def skip_original_created_validation?
+    return false if new_record?
+    return false if will_save_change_to_original_created_from?
+    return false if will_save_change_to_original_created_before?
+
+    true
+  end
 end