1 files changed, 11 insertions, 0 deletions
diff --git a/app/models/milestone.rb b/app/models/milestone.rb
index 787600569fa..37c129e843a 100644
--- a/app/models/milestone.rb
+++ b/app/models/milestone.rb
@@ -58,6 +58,7 @@ class Milestone < ApplicationRecord
   validate :uniqueness_of_title, if: :title_changed?
   validate :milestone_type_check
   validate :start_date_should_be_less_than_due_date, if: proc { |m| m.start_date.present? && m.due_date.present? }
+  validate :dates_within_4_digits
 
   strip_attributes :title
 
@@ -326,6 +327,16 @@ class Milestone < ApplicationRecord
     end
   end
 
+  def dates_within_4_digits
+    if start_date && start_date > Date.new(9999, 12, 31)
+      errors.add(:start_date, _("date must not be after 9999-12-31"))
+    end
+
+    if due_date && due_date > Date.new(9999, 12, 31)
+      errors.add(:due_date, _("date must not be after 9999-12-31"))
+    end
+  end
+
   def issues_finder_params
     { project_id: project_id }
   end