use Chronic gem to parse uploaded date data

Gemfile

@@ -30,6 +30,7 @@ gem 'rack-utf8_sanitizer'
 gem 'newrelic_rpm'
 gem 'actionpack-xml_parser'
 gem 'activeadmin', github: 'gregbell/active_admin'
+gem 'chronic'
 
 # to use debugger
 # gem 'ruby-debug'

Gemfile.lock

@@ -90,6 +90,7 @@ GEM
       net-sftp (>= 2.0.0)
       net-ssh (>= 2.0.14)
       net-ssh-gateway (>= 1.1.0)
+    chronic (0.10.2)
     coffee-rails (4.0.1)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0, < 5.0)
@@ -345,6 +346,7 @@ DEPENDENCIES
   autotest
   autotest-rails
   capistrano (~> 2.15.4)
+  chronic
   coffee-rails (~> 4.0)
   daemons
   dalli

app/controllers/channels_controller.rb

@@ -372,6 +372,7 @@ class ChannelsController < ApplicationController
 
     # set time zone
     Time.zone = params[:feed][:time_zone]
+    Chronic.time_class = Time.zone
 
     # read data from uploaded file
     csv_array = CSV.parse(params[:upload][:csv].read)
@@ -409,8 +410,8 @@ class ChannelsController < ApplicationController
 
     # if 2 or more rows
     if !csv_array[1].blank?
-      date1 = parse_date ? Time.parse(csv_array[0][0]) : Time.at(csv_array[0][0])
-      date2 = parse_date ? Time.parse(csv_array[1][0]) : Time.at(csv_array[1][0])
+      date1 = Chronic.parse(csv_array[0][0]) if parse_date
+      date2 = Chronic.parse(csv_array[1][0]) if parse_date
 
       # reverse the array if 1st date is larger than 2nd date
       csv_array = csv_array.reverse if date1 > date2
@@ -440,7 +441,7 @@ class ChannelsController < ApplicationController
 
         # set feed data
         feed.channel_id = channel.id
-        feed.created_at = parse_date ? Time.zone.parse(row[0]) : Time.zone.at(row[0].to_f)
+        feed.created_at = Chronic.parse(row[0]) if parse_date
         feed.field1 = row[1]
         feed.field2 = row[2]
         feed.field3 = row[3]

app/controllers/windows_controller.rb

@@ -217,3 +217,4 @@ class WindowsController < ApplicationController
 
   end
 end
+