[feat]Properly add timezone to events starttime and endtime; set now to be the time in conference timezone instead of the user s time zone in fullcalendar

app/assets/javascripts/fullcalendar.js

@@ -6,6 +6,7 @@ $( document ).ready(function() {
     var calendar = new FullCalendar.Calendar(calendarEl, {
       schedulerLicenseKey: fullcalData.data('schedulerLicenseKey'),
       nowIndicator: true,
+      now: fullcalData.data('now'),
       expandRows: true,
       allDaySlot: false,
       slotMinTime: fullcalData.data('startHour') + ':00:00',
@@ -14,7 +15,7 @@ $( document ).ready(function() {
         start: fullcalData.data('startDate'),
         end: fullcalData.data('endDate')
       },
-      timeZone: 'UTC', // TODO: Events are stored in conference's timezone implicitly (UTC+0) in the database 
+      timeZone: fullcalData.data('timezone'),
       initialDate: fullcalData.data('day'),
       initialView: 'resourceTimeGridDay',
       resources: fullcalData.data('rooms'),

app/controllers/schedules_controller.rb

@@ -94,6 +94,7 @@ class SchedulesController < ApplicationController
 
     @rooms = FullCalendarFormatter.rooms_to_resources(@conference.venue.rooms) if @conference.venue
     @event_schedules = FullCalendarFormatter.event_schedules_to_resources(event_schedules)
+    @now = Time.now.in_time_zone(@conference.timezone).strftime('%FT%T%:z')
     @scheduler_license_key = Rails.configuration.fullcalendar[:license_key]
   end
 

app/models/event_schedule.rb

@@ -133,6 +133,14 @@ class EventSchedule < ApplicationRecord
       other.schedule_id == schedule_id
   end
 
+  def start_time_in_conference_timezone
+    time_in_conference_timezone(start_time)
+  end
+
+  def end_time_in_conference_timezone
+    time_in_conference_timezone(end_time)
+  end
+
   private
 
   def replaced_event_schedules
@@ -187,4 +195,10 @@ class EventSchedule < ApplicationRecord
 
     errors.add(:schedule, "must be one of #{event.track.name} track's schedules") unless event.track.schedules.include?(schedule)
   end
+
+  def time_in_conference_timezone(time)
+    time_in_tz = time.in_time_zone(timezone)
+    time_in_tz -= time_in_tz.utc_offset
+    time_in_tz
+  end
 end

app/services/full_calendar_formatter.rb

@@ -29,8 +29,8 @@ class FullCalendarFormatter
       {
         id:              event_schedule.event.guid,
         title:           event_schedule.event.title,
-        start:           event_schedule.start_time,
-        end:             event_schedule.end_time,
+        start:           event_schedule.start_time_in_conference_timezone,
+        end:             event_schedule.end_time_in_conference_timezone,
         resourceId:      event_schedule.room.guid,
         url:             url,
         borderColor:     event_type_color,

app/views/schedules/vertical_schedule.haml

@@ -8,6 +8,6 @@
   #vert-schedule-full-calendar
   #fullcalendar{ data: { rooms: @rooms, events: @event_schedules, day: @day,
   'start-hour': @conference.start_hour, 'end-hour': @conference.end_hour,
-  'start-date': @conference.start_date,
-  'end-date': @conference.end_date + 1.day,
+  'start-date': @conference.start_date, 'end-date': @conference.end_date + 1.day,
+  'timezone': @conference.timezone, 'now': @now,
   'scheduler-license-key': @scheduler_license_key } }

spec/services/full_calendar_formatter_spec.rb

@@ -45,8 +45,8 @@ describe FullCalendarFormatter do
         {
           id:              event_schedule1.event.guid,
           title:           event_schedule1.event.title,
-          start:           event_schedule1.start_time,
-          end:             event_schedule1.end_time,
+          start:           event_schedule1.start_time_in_conference_timezone,
+          end:             event_schedule1.end_time_in_conference_timezone,
           resourceId:      room1.guid,
           url:             Rails.application.routes.url_helpers.conference_program_proposal_path(conference.short_title, event1.id),
           borderColor:     event1.event_type.color,
@@ -56,8 +56,8 @@ describe FullCalendarFormatter do
         {
           id:              event_schedule2.event.guid,
           title:           event_schedule2.event.title,
-          start:           event_schedule2.start_time,
-          end:             event_schedule2.end_time,
+          start:           event_schedule2.start_time_in_conference_timezone,
+          end:             event_schedule2.end_time_in_conference_timezone,
           resourceId:      room2.guid,
           url:             Rails.application.routes.url_helpers.conference_program_proposal_path(conference.short_title, event2.id),
           borderColor:     event2.event_type.color,