Fixed issue #2697 - Time zone incorrectly calculated in ticket list.

app/controllers/reports_controller.rb

@@ -315,8 +315,9 @@ class ReportsController < ApplicationController
 
     if timezone.present?
       offset = time.in_time_zone(timezone).utc_offset
-      time -= offset
+      time += offset
     end
-    time.utc.iso8601.to_s.sub(/Z$/, '')
+    local_time = time.utc.iso8601.to_s.sub(/Z$/, '')
+    local_time.sub(/T/, ' ')
   end
 end

spec/requests/report_spec.rb

@@ -81,6 +81,10 @@ RSpec.describe 'Report', type: :request, searchindex: true do
       expect(@response['Content-Type']).to eq('application/vnd.ms-excel')
     end
 
+    it 'does convert UTC timestamp to local system based timestamp' do
+      expect(ReportsController.new.time_in_localtime_for_excel(Time.parse('2019-08-08T01:00:05Z').in_time_zone, 'Europe/Berlin')).to eq('2019-08-08 03:00:05')
+    end
+
     it 'does report example - deliver result' do
       skip('No ES configured') if !SearchIndexBackend.enabled?