diff --git a/lib/pact_broker/api/decorators/format_date_time.rb b/lib/pact_broker/api/decorators/format_date_time.rb
index bfd81a9b3..5303a63be 100644
--- a/lib/pact_broker/api/decorators/format_date_time.rb
+++ b/lib/pact_broker/api/decorators/format_date_time.rb
@@ -2,8 +2,16 @@ module PactBroker
   module Api
     module Decorators
       module FormatDateTime
+        # Keep this in sync with Sequel.datetime_class.
+        # Needs to be upgraded from DateTime to Time as Time is deprecated
+        DATE_TIME_CLASS = DateTime
+
         def self.call(date_time)
-          date_time.to_time.utc.to_datetime.xmlschema if date_time
+          if date_time.is_a?(String)
+            DATE_TIME_CLASS.strptime(date_time).to_time.utc.to_datetime.xmlschema
+          elsif date_time
+            date_time.to_time.utc.to_datetime.xmlschema if date_time
+          end
         end
 
         def format_date_time(date_time)
diff --git a/spec/lib/pact_broker/api/decorators/format_date_time_spec.rb b/spec/lib/pact_broker/api/decorators/format_date_time_spec.rb
new file mode 100644
index 000000000..8b148602e
--- /dev/null
+++ b/spec/lib/pact_broker/api/decorators/format_date_time_spec.rb
@@ -0,0 +1,35 @@
+require "pact_broker/api/decorators/format_date_time"
+
+module PactBroker
+  module Api
+    module Decorators
+      module FormatDateTime
+        describe ".call" do
+          context "with a Time object" do
+            let(:date_time) { Time.parse("2022-02-14T15:18:00+14:00" )}
+
+            it "converts the date to a string in utc" do
+              expect(FormatDateTime.call(date_time)).to eq "2022-02-14T01:18:00+00:00"
+            end
+          end
+
+          context "with a DateTime object" do
+            let(:date_time) { DateTime.parse("2022-02-14T15:18:00+14:00" )}
+
+            it "converts the date to a string in utc" do
+              expect(FormatDateTime.call(date_time)).to eq "2022-02-14T01:18:00+00:00"
+            end
+          end
+
+          context "with a String - MySQL and Sqlite (as of the upgrade to Ruby 2.7.5) return date columns as strings. Postgres returns them as dates." do
+            let(:date_time) { "2022-02-14T15:18:00+14:00" }
+
+            it "converts the date to a string in utc" do
+              expect(FormatDateTime.call(date_time)).to eq "2022-02-14T01:18:00+00:00"
+            end
+          end
+        end
+      end
+    end
+  end
+end