diff --git a/spec/models/verification/management/document_spec.rb b/spec/models/verification/management/document_spec.rb
index b4140f7ed..35fd89855 100644
--- a/spec/models/verification/management/document_spec.rb
+++ b/spec/models/verification/management/document_spec.rb
@@ -3,35 +3,35 @@ require 'rails_helper'
 describe Verification::Management::Document do
   describe "#valid_age?" do
     it "returns false when the user is younger than sixteen years old" do
-      census_response = double(date_of_birth: "31-12-#{16.years.ago.year}")
+      census_response = double(date_of_birth: Date.new(16.years.ago.year, 12, 31))
       expect(Verification::Management::Document.new.valid_age?(census_response)).to be false
     end
 
     it "returns true when the user is sixteen years old" do
-      census_response = double(date_of_birth: 16.years.ago.strftime("%d-%m-%Y"))
+      census_response = double(date_of_birth: Date.new(16.years.ago.year, 16.years.ago.month, 16.years.ago.day))
       expect(Verification::Management::Document.new.valid_age?(census_response)).to be true
     end
 
     it "returns true when the user is older than sixteen years old" do
-      census_response = double(date_of_birth: "31-12-#{33.years.ago.year}")
+      census_response = double(date_of_birth: Date.new(33.years.ago.year, 12, 31))
       expect(Verification::Management::Document.new.valid_age?(census_response)).to be true
     end
   end
 
   describe "#under_sixteen?" do
     it "returns true when the user is younger than sixteen years old" do
-      census_response = double(date_of_birth: "31-12-#{16.years.ago.year}")
+      census_response = double(date_of_birth: Date.new(16.years.ago.year, 12, 31))
       expect(Verification::Management::Document.new.under_sixteen?(census_response)).to be true
     end
 
     it "returns false when the user is sixteen years old" do
-      census_response = double(date_of_birth: 16.years.ago.strftime("%d-%m-%Y"))
+      census_response = double(date_of_birth: Date.new(16.years.ago.year, 16.years.ago.month, 16.years.ago.day))
       expect(Verification::Management::Document.new.under_sixteen?(census_response)).to be false
     end
 
     it "returns false when the user is older than sixteen years old" do
-      census_response = double(date_of_birth: "31-12-#{33.years.ago.year}")
+      census_response = double(date_of_birth: Date.new(33.years.ago.year, 12, 31))
       expect(Verification::Management::Document.new.under_sixteen?(census_response)).to be false
     end
   end
-end
\ No newline at end of file
+end