diff --git a/lib/api/decorators/single.rb b/lib/api/decorators/single.rb
index 70d293f6b1..ded3fa5661 100644
--- a/lib/api/decorators/single.rb
+++ b/lib/api/decorators/single.rb
@@ -53,6 +53,10 @@ module API
 
       private
 
+      def datetime_formatter
+        API::V3::Utilities::DateTimeFormatter
+      end
+
       def _type; end
     end
   end
diff --git a/lib/api/v3/activities/activity_representer.rb b/lib/api/v3/activities/activity_representer.rb
index 1e368540c3..17a25924b1 100644
--- a/lib/api/v3/activities/activity_representer.rb
+++ b/lib/api/v3/activities/activity_representer.rb
@@ -29,7 +29,8 @@
 
 require 'roar/decorator'
 require 'roar/json/hal'
-require 'api/v3/utilities/date_time_formatter'
+
+API::V3::Utilities::DateTimeFormatter
 
 module API
   module V3
diff --git a/lib/api/v3/attachments/attachment_representer.rb b/lib/api/v3/attachments/attachment_representer.rb
index 6c1726e29d..83cc23ec76 100644
--- a/lib/api/v3/attachments/attachment_representer.rb
+++ b/lib/api/v3/attachments/attachment_representer.rb
@@ -29,7 +29,6 @@
 
 require 'roar/decorator'
 require 'roar/json/hal'
-require 'api/v3/utilities/date_time_formatter'
 
 module API
   module V3
diff --git a/lib/api/v3/projects/project_representer.rb b/lib/api/v3/projects/project_representer.rb
index 28d4b02838..feaa079b6b 100644
--- a/lib/api/v3/projects/project_representer.rb
+++ b/lib/api/v3/projects/project_representer.rb
@@ -29,13 +29,11 @@
 
 require 'roar/decorator'
 require 'roar/json/hal'
-require 'api/v3/utilities/date_time_formatter'
 
 module API
   module V3
     module Projects
       class ProjectRepresenter < ::API::Decorators::Single
-        include API::V3::Utilities
 
         link :self do
           {
@@ -61,10 +59,12 @@ module API
 
         property :created_on,
                  as: 'createdAt',
-                 getter: -> (*) { DateTimeFormatter::format_datetime(created_on) }
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.created_on) }
         property :updated_on,
                  as: 'updatedAt',
-                 getter: -> (*) { DateTimeFormatter::format_datetime(updated_on) }
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.updated_on) }
 
         property :type, getter: -> (*) { project_type.try(:name) }, render_nil: true
 
diff --git a/lib/api/v3/users/user_representer.rb b/lib/api/v3/users/user_representer.rb
index 92b83bd09b..e55740cbe0 100644
--- a/lib/api/v3/users/user_representer.rb
+++ b/lib/api/v3/users/user_representer.rb
@@ -29,14 +29,12 @@
 
 require 'roar/decorator'
 require 'roar/json/hal'
-require 'api/v3/utilities/date_time_formatter'
 
 module API
   module V3
     module Users
       class UserRepresenter < ::API::Decorators::Single
         include AvatarHelper
-        include API::V3::Utilities
 
         link :self do
           {
@@ -89,10 +87,12 @@ module API
                           exec_context: :decorator
         property :created_on,
                  as: 'createdAt',
-                 getter: -> (*) { DateTimeFormatter::format_datetime(created_on) }
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.created_on) }
         property :updated_on,
                  as: 'updatedAt',
-                 getter: -> (*) { DateTimeFormatter::format_datetime(updated_on) }
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.updated_on) }
         property :status, getter: -> (*) { status_name }, render_nil: true
 
         def _type
diff --git a/lib/api/v3/versions/version_representer.rb b/lib/api/v3/versions/version_representer.rb
index 405ee2dd38..2f5f8d5e19 100644
--- a/lib/api/v3/versions/version_representer.rb
+++ b/lib/api/v3/versions/version_representer.rb
@@ -29,13 +29,11 @@
 
 require 'roar/decorator'
 require 'roar/json/hal'
-require 'api/v3/utilities/date_time_formatter'
 
 module API
   module V3
     module Versions
       class VersionRepresenter < ::API::Decorators::Single
-        include API::V3::Utilities
 
         link :self do
           {
@@ -71,19 +69,27 @@ module API
                  render_nil: true
 
         property :start_date,
-                 getter: -> (*) { DateTimeFormatter::format_date(start_date, allow_nil: true) },
+                 exec_context: :decorator,
+                 getter: -> (*) {
+                   datetime_formatter.format_date(represented.start_date, allow_nil: true)
+                 },
                  render_nil: true
         property :due_date,
                  as: 'endDate',
-                 getter: -> (*) { DateTimeFormatter::format_date(due_date, allow_nil: true) },
+                 exec_context: :decorator,
+                 getter: -> (*) {
+                   datetime_formatter.format_date(represented.due_date, allow_nil: true)
+                 },
                  render_nil: true
         property :status, render_nil: true
         property :created_on,
                  as: 'createdAt',
-                 getter: -> (*) { DateTimeFormatter::format_datetime(created_on) }
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.created_on) }
         property :updated_on,
                  as: 'updatedAt',
-                 getter: -> (*) { DateTimeFormatter::format_datetime(updated_on) }
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.updated_on) }
 
         def _type
           'Version'
diff --git a/lib/api/v3/work_packages/form/work_package_payload_representer.rb b/lib/api/v3/work_packages/form/work_package_payload_representer.rb
index 21567f920b..7d3fe4b48a 100644
--- a/lib/api/v3/work_packages/form/work_package_payload_representer.rb
+++ b/lib/api/v3/work_packages/form/work_package_payload_representer.rb
@@ -29,7 +29,6 @@
 
 require 'roar/decorator'
 require 'roar/json/hal'
-require 'api/v3/utilities/date_time_formatter'
 
 module API
   module V3
@@ -38,7 +37,6 @@ module API
         class WorkPackagePayloadRepresenter < Roar::Decorator
           include Roar::JSON::HAL
           include Roar::Hypermedia
-          include API::V3::Utilities
 
           self.as_strategy = ::API::Utilities::CamelCasingStrategy.new
 
@@ -86,10 +84,10 @@ module API
           property :start_date,
                    exec_context: :decorator,
                    getter: -> (*) {
-                     DateTimeFormatter::format_date(represented.start_date, allow_nil: true)
+                     datetime_formatter.format_date(represented.start_date, allow_nil: true)
                    },
                    setter: -> (value, *) {
-                     represented.start_date = DateTimeFormatter::parse_date(value,
+                     represented.start_date = datetime_formatter.parse_date(value,
                                                                             'startDate',
                                                                             allow_nil: true)
                    },
@@ -97,10 +95,10 @@ module API
           property :due_date,
                    exec_context: :decorator,
                    getter: -> (*) {
-                     DateTimeFormatter::format_date(represented.due_date, allow_nil: true)
+                     datetime_formatter.format_date(represented.due_date, allow_nil: true)
                    },
                    setter: -> (value, *) {
-                     represented.due_date = DateTimeFormatter::parse_date(value,
+                     represented.due_date = datetime_formatter.parse_date(value,
                                                                           'dueDate',
                                                                           allow_nil: true)
                    },
@@ -120,6 +118,10 @@ module API
 
           private
 
+          def datetime_formatter
+            API::V3::Utilities::DateTimeFormatter
+          end
+
           def work_package_attribute_links_representer(represented)
             ::API::V3::WorkPackages::Form::WorkPackageAttributeLinksRepresenter.new represented
           end
diff --git a/lib/api/v3/work_packages/work_package_representer.rb b/lib/api/v3/work_packages/work_package_representer.rb
index 2451cf0cbb..edc6388b90 100644
--- a/lib/api/v3/work_packages/work_package_representer.rb
+++ b/lib/api/v3/work_packages/work_package_representer.rb
@@ -29,13 +29,11 @@
 
 require 'roar/decorator'
 require 'roar/json/hal'
-require 'api/v3/utilities/date_time_formatter'
 
 module API
   module V3
     module WorkPackages
       class WorkPackageRepresenter < ::API::Decorators::Single
-        include API::V3::Utilities
 
         link :self do
           {
@@ -242,29 +240,31 @@ module API
                  render_nil: true
 
         property :start_date,
+                 exec_context: :decorator,
                  getter: -> (*) do
-                   DateTimeFormatter::format_date(start_date, allow_nil: true)
+                   datetime_formatter.format_date(represented.start_date, allow_nil: true)
                  end,
                  render_nil: true
         property :due_date,
+                 exec_context: :decorator,
                  getter: -> (*) do
-                   DateTimeFormatter::format_date(due_date, allow_nil: true)
+                   datetime_formatter.format_date(represented.due_date, allow_nil: true)
                  end,
                  render_nil: true
         property :estimated_time,
+                 exec_context: :decorator,
                  getter: -> (*) do
-                   DateTimeFormatter::format_duration_from_hours(represented.estimated_hours,
+                   datetime_formatter.format_duration_from_hours(represented.estimated_hours,
                                                                  allow_nil: true)
                  end,
-                 exec_context: :decorator,
                  render_nil: true,
                  writeable: false
         property :spent_time,
+                 exec_context: :decorator,
                  getter: -> (*) do
-                   DateTimeFormatter::format_duration_from_hours(represented.spent_hours)
+                   datetime_formatter.format_duration_from_hours(represented.spent_hours)
                  end,
                  writeable: false,
-                 exec_context: :decorator,
                  if: -> (_) { current_user_allowed_to(:view_time_entries) }
         property :percentage_done,
                  render_nil: true,
@@ -279,8 +279,12 @@ module API
         property :project_id, getter: -> (*) { project.id }
         property :project_name, getter: -> (*) { project.try(:name) }
         property :parent_id, writeable: true
-        property :created_at, getter: -> (*) { DateTimeFormatter::format_datetime(created_at) }
-        property :updated_at, getter: -> (*) { DateTimeFormatter::format_datetime(updated_at) }
+        property :created_at,
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.created_at) }
+        property :updated_at,
+                 exec_context: :decorator,
+                 getter: -> (*) { datetime_formatter.format_datetime(represented.updated_at) }
 
         collection :custom_properties, exec_context: :decorator, render_nil: true
 
diff --git a/spec/lib/api/v3/utilities/date_time_formatter_spec.rb b/spec/lib/api/v3/utilities/date_time_formatter_spec.rb
index 08f1ac6910..7f49839c4a 100644
--- a/spec/lib/api/v3/utilities/date_time_formatter_spec.rb
+++ b/spec/lib/api/v3/utilities/date_time_formatter_spec.rb
@@ -27,7 +27,6 @@
 #++
 
 require 'spec_helper'
-require 'api/v3/utilities/date_time_formatter'
 
 describe :DateTimeFormatter do
   subject { ::API::V3::Utilities::DateTimeFormatter }