diff --git a/app/controllers/oaisys/pmh_controller.rb b/app/controllers/oaisys/pmh_controller.rb
index e95e6c6..78e8736 100644
--- a/app/controllers/oaisys/pmh_controller.rb
+++ b/app/controllers/oaisys/pmh_controller.rb
@@ -74,7 +74,7 @@ def list_metadata_formats
     end
 
     render :list_metadata_formats,
-           formats: :xml, locals: { formats: formats, parameters: parameters }
+           formats: :xml, locals: { formats: formats, parameters: prep_identifiers(parameters) }
   end
 
   def list_records
@@ -118,7 +118,7 @@ def get_record
 
     raise Oaisys::IdDoesNotExistError.new(parameters: params) if obj.blank?
 
-    render :get_record, formats: :xml, locals: { item: obj, metadata_format: metadata_format }
+    render :get_record, formats: :xml, locals: { item: obj, parameters: prep_identifiers(params) }
   end
   # rubocop:enable Naming/AccessorMethodName
 
@@ -218,7 +218,11 @@ def public_items_for_metadata_format(verb:, format:, page:, restricted_to_set: n
     model = model.public_items.belongs_to_path(restricted_to_set.tr(':', '/')) if restricted_to_set.present?
 
     model = model.updated_on_or_after(from_date) if from_date.present?
-    model = model.updated_on_or_before(until_date) if until_date.present?
+
+    if until_date.present?
+      just_after_until_date = (until_date.to_time + 1.second).utc.xmlschema
+      model = model.updated_before(just_after_until_date)
+    end
 
     items_per_request = Oaisys::Engine.config.items_per_request
     model = model.page(page).per(items_per_request)
@@ -269,4 +273,9 @@ def check_resumption_token(model, resumption_token_provided, total_count, parame
     raise Oaisys::BadResumptionTokenError.new, I18n.t('error_messages.resumption_token_invalid')
   end
 
+  def prep_identifiers(parameters)
+    parameters['identifier'].prepend('oai:era.library.ualberta.ca:') if parameters['identifier'].present?
+    parameters
+  end
+
 end
diff --git a/app/views/oaisys/pmh/get_record.xml.builder b/app/views/oaisys/pmh/get_record.xml.builder
index c442e76..0c7b316 100644
--- a/app/views/oaisys/pmh/get_record.xml.builder
+++ b/app/views/oaisys/pmh/get_record.xml.builder
@@ -19,18 +19,17 @@ xml.push_deferred_attribute('xmlns:dc': 'http://purl.org/dc/elements/1.1/',
                             'http://www.ndltd.org/standards/metadata/etdms/1-0/etdms.xsd '\
                             'http://www.w3.org/2005/Atom')
 
-xml.tag!('request', 'https://era.library.ualberta.ca/oai', verb: 'GetRecord', metadataPrefix: metadata_format,
-                                                           identifier: item.id)
+xml.tag!('request', parameters, 'https://era.library.ualberta.ca/oai')
 
 xml.GetRecord do |get_record|
   get_record.record do |record|
     record.header do |header|
-      header.identifier "oai:era.library.ualberta.ca:#{item.id}"
-      header.datestamp item.updated_at
+      header.identifier parameters[:identifier]
+      header.datestamp item.updated_at.utc.xmlschema
       item.member_of_paths.each { |path| header.setSpec path.tr('/', ':') }
     end
     record.metadata do |metadata_xml|
-      item.serialize_metadata(format: metadata_format, into_document: metadata_xml)
+      item.serialize_metadata(format: parameters[:metadataPrefix], into_document: metadata_xml)
     end
   end
 end
diff --git a/app/views/oaisys/pmh/list_records.xml.builder b/app/views/oaisys/pmh/list_records.xml.builder
index 5cc1797..535b580 100644
--- a/app/views/oaisys/pmh/list_records.xml.builder
+++ b/app/views/oaisys/pmh/list_records.xml.builder
@@ -26,7 +26,7 @@ xml.ListRecords do |list_records|
     list_records.record do |record|
       record.header do |header|
         header.identifier "oai:era.library.ualberta.ca:#{item.id}"
-        header.datestamp item.updated_at
+        header.datestamp item.updated_at.utc.xmlschema
         item.member_of_paths.each { |path| header.setSpec path.tr('/', ':') }
       end
       record.metadata do |metadata_xml|