diff --git a/app/assets/javascripts/app/controllers/calendar.js.coffee b/app/assets/javascripts/app/controllers/calendar.js.coffee
index 84acd5c2b..3640e8686 100644
--- a/app/assets/javascripts/app/controllers/calendar.js.coffee
+++ b/app/assets/javascripts/app/controllers/calendar.js.coffee
@@ -35,6 +35,16 @@ class Index extends App.ControllerContent
     )
     for calendar in calendars
 
+      # validate config
+      for day in ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun']
+        if !calendar.business_hours[day]
+          calendar.business_hours[day] = {}
+      for day, meta of calendar.business_hours
+        if !meta.active
+          meta.active = false
+        if !meta.timeframes
+          meta.timeframes = []
+
       # get preview public holidays
       public_holidays_preview = {}
       if calendar.public_holidays
diff --git a/app/assets/javascripts/app/lib/app_post/business_hours.js.coffee b/app/assets/javascripts/app/lib/app_post/business_hours.js.coffee
index 75043ed29..03617e3fd 100644
--- a/app/assets/javascripts/app/lib/app_post/business_hours.js.coffee
+++ b/app/assets/javascripts/app/lib/app_post/business_hours.js.coffee
@@ -20,6 +20,16 @@ class App.BusinessHours extends Spine.Controller
       sat: App.i18n.translateInline('Saturday')
       sun: App.i18n.translateInline('Sunday')
 
+    # validate config
+    for day of @days
+      if !@hours[day]
+        @hours[day] = {}
+    for day, meta of @hours
+      if !meta.active
+        meta.active = false
+      if !meta.timeframes
+        meta.timeframes = []
+
   render: =>
     @updateMaxTimeframes()
 
@@ -73,7 +83,6 @@ class App.BusinessHours extends Spine.Controller
   validate: =>
     for day, hours of @options.hours
       break if !hours.active
-      break if !hours.timeframes
 
       # edge case: full day
       if hours.timeframes[0][0] is '00:00' and hours.timeframes[hours.timeframes.length - 1][1] is '00:00'
diff --git a/app/assets/javascripts/app/views/calendar/index.jst.eco b/app/assets/javascripts/app/views/calendar/index.jst.eco
index 192803a05..2913d691a 100644
--- a/app/assets/javascripts/app/views/calendar/index.jst.eco
+++ b/app/assets/javascripts/app/views/calendar/index.jst.eco
@@ -28,25 +28,25 @@
       <div class="label"><%- @T('Business Hours') %></div>
       <table class="table table-fluid">
         <tr>
-          <td><%- @T('Monday') %></td><td><% if _.isEmpty(calendar.business_hours['mon']): %>-<% else: %><% for from, till of calendar.business_hours['mon']: %><%= from %>-<%= till %> </td><td><% end %><% end %></td>
+          <td><%- @T('Monday') %></td><td><% if !calendar.business_hours['mon'].active || _.isEmpty(calendar.business_hours['mon'].timeframes): %>-<% else: %><% for frame in calendar.business_hours['mon'].timeframes: %><%= frame[0] %>-<%= frame[1] %> </td><td><% end %><% end %></td>
         </tr>
         <tr>
-          <td><%- @T('Tuesday') %></td><td><% if _.isEmpty(calendar.business_hours['tue']): %>-<% else: %><% for from, till of calendar.business_hours['tue']: %><%= from %>-<%= till %> </td><td><% end %><% end %></td>
+          <td><%- @T('Tuesday') %></td><td><% if !calendar.business_hours['tue'].active || _.isEmpty(calendar.business_hours['tue'].timeframes): %>-<% else: %><% for frame in calendar.business_hours['tue'].timeframes: %><%= frame[0] %>-<%= frame[1] %> </td><td><% end %><% end %></td>
         </tr>
         <tr>
-          <td><%- @T('Wednesday') %></td><td><% if _.isEmpty(calendar.business_hours['wed']): %>-<% else: %><% for from, till of calendar.business_hours['wed']: %><%= from %>-<%= till %> </td><td><% end %><% end %></td>
+          <td><%- @T('Wednesday') %></td><td><% if !calendar.business_hours['wed'].active || _.isEmpty(calendar.business_hours['wed'].timeframes): %>-<% else: %><% for frame in calendar.business_hours['wed'].timeframes: %><%= frame[0] %>-<%= frame[1] %> </td><td><% end %><% end %></td>
         </tr>
         <tr>
-          <td><%- @T('Thursday') %></td><td><% if _.isEmpty(calendar.business_hours['thu']): %>-<% else: %><% for from, till of calendar.business_hours['thu']: %><%= from %>-<%= till %> </td><td><% end %><% end %></td>
+          <td><%- @T('Thursday') %></td><td><% if !calendar.business_hours['thu'].active || _.isEmpty(calendar.business_hours['thu'].timeframes): %>-<% else: %><% for frame in calendar.business_hours['thu'].timeframes: %><%= frame[0] %>-<%= frame[1] %> </td><td><% end %><% end %></td>
         </tr>
         <tr>
-          <td><%- @T('Friday') %></td><td><% if _.isEmpty(calendar.business_hours['fri']): %>-<% else: %><% for from, till of calendar.business_hours['fri']: %><%= from %>-<%= till %> </td><td><% end %><% end %></td>
+          <td><%- @T('Friday') %></td><td><% if !calendar.business_hours['fri'].active || _.isEmpty(calendar.business_hours['fri'].timeframes): %>-<% else: %><% for frame in calendar.business_hours['fri'].timeframes: %><%= frame[0] %>-<%= frame[1] %> </td><td><% end %><% end %></td>
         </tr>
         <tr>
-          <td><%- @T('Saturday') %></td><td><% if _.isEmpty(calendar.business_hours['sat']): %>-<% else: %><% for from, till of calendar.business_hours['sat']: %><%= from %>-<%= till %> </td><td><% end %><% end %></td>
+          <td><%- @T('Saturday') %></td><td><% if !calendar.business_hours['sat'].active || _.isEmpty(calendar.business_hours['sat'].timeframes): %>-<% else: %><% for frame in calendar.business_hours['sat'].timeframes: %><%= frame[0] %>-<%= frame[1] %> </td><td><% end %><% end %></td>
         </tr>
         <tr>
-          <td><%- @T('Sunday') %></td><td><% if _.isEmpty(calendar.business_hours['sun']): %>-<% else: %><% for from, till of calendar.business_hours['sun']: %><%= from %>-<%= till %> </td><td><% end %><% end %></td>
+          <td><%- @T('Sunday') %></td><td><% if !calendar.business_hours['sun'].active || _.isEmpty(calendar.business_hours['sun'].timeframes): %>-<% else: %><% for frame in calendar.business_hours['sun'].timeframes: %><%= frame[0] %>-<%= frame[1] %> </td><td><% end %><% end %></td>
         </tr>
       </table>
     </div>
diff --git a/app/models/ticket/escalation.rb b/app/models/ticket/escalation.rb
index 912dc0519..62c3042d3 100644
--- a/app/models/ticket/escalation.rb
+++ b/app/models/ticket/escalation.rb
@@ -68,7 +68,18 @@ returns
     self.close_time_escal_date     = nil
 
     biz = Biz::Schedule.new do |config|
-      config.hours = calendar.business_hours.symbolize_keys
+      hours = {}
+      calendar.business_hours.each {|day, meta|
+        next if !meta[:active]
+        next if !meta[:timeframes]
+        hours[day.to_sym] = {}
+        meta[:timeframes].each {|frame|
+          next if !frame[0]
+          next if !frame[1]
+          hours[day.to_sym][frame[0]] = frame[1]
+        }
+      }
+      config.hours = hours
       #config.holidays = [Date.new(2014, 1, 1), Date.new(2014, 12, 25)]
       config.time_zone = calendar.timezone
     end
@@ -124,8 +135,8 @@ returns
 
     # close time
     # calculate close time escalation
-    if sla.close_time
-      self.close_time_escal_date = biz.time(sla.close_time, :minutes).after(created_at)
+    if sla.solution_time
+      self.close_time_escal_date = biz.time(sla.solution_time, :minutes).after(created_at)
       pending_time = pending_minutes(created_at, first_response_escal_date, biz)
       if pending_time && pending_time > 0
         self.close_time_escal_date = biz.time(pending_time, :minutes).after(close_time_escal_date)
@@ -142,8 +153,8 @@ returns
     end
 
     # set time to show if sla is raised or not
-    if sla.close_time && close_time_in_min
-      self.close_time_diff_in_min = sla.close_time - close_time_in_min
+    if sla.solution_time && close_time_in_min
+      self.close_time_diff_in_min = sla.solution_time - close_time_in_min
     end
 
     if escalation_disabled
diff --git a/db/migrate/20150974000001_update_sla1.rb b/db/migrate/20150974000001_update_sla1.rb
new file mode 100644
index 000000000..fbc05096a
--- /dev/null
+++ b/db/migrate/20150974000001_update_sla1.rb
@@ -0,0 +1,5 @@
+class UpdateSla1 < ActiveRecord::Migration
+  def up
+    rename_column :slas, :close_time, :solution_time
+  end
+end
diff --git a/test/unit/ticket_sla_test.rb b/test/unit/ticket_sla_test.rb
index 1e1b0dca1..0ab866e1f 100644
--- a/test/unit/ticket_sla_test.rb
+++ b/test/unit/ticket_sla_test.rb
@@ -29,11 +29,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 1',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '09:00' => '17:00' },
-        tue: { '09:00' => '17:00' },
-        wed: { '09:00' => '17:00' },
-        thu: { '09:00' => '17:00' },
-        fri: { '09:00' => '17:00' }
+        mon: {
+          active: true,
+          timeframes: [ ['09:00', '17:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['09:00', '17:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['09:00', '17:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['09:00', '17:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['09:00', '17:00'] ]
+        },
+        sat: {
+          active: false,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        sun: {
+          active: false,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -46,7 +69,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       condition: {},
       first_response_time: 120,
       update_time: 180,
-      close_time: 240,
+      solution_time: 240,
       calendar_id: calendar1.id,
       updated_by_id: 1,
       created_by_id: 1,
@@ -63,13 +86,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 2',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '08:00' => '18:00' },
-        tue: { '08:00' => '18:00' },
-        wed: { '08:00' => '18:00' },
-        thu: { '08:00' => '18:00' },
-        fri: { '08:00' => '18:00' },
-        sat: { '08:00' => '18:00' },
-        sun: { '08:00' => '18:00' },
+        mon: {
+          active: true,
+          timeframes: [ ['08:00', '18:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['08:00', '18:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['08:00', '18:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['08:00', '18:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['08:00', '18:00'] ]
+        },
+        sat: {
+          active: false,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        sun: {
+          active: false,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -82,7 +126,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar2.id,
       first_response_time: 60,
       update_time: 120,
-      close_time: 180,
+      solution_time: 180,
       updated_by_id: 1,
       created_by_id: 1,
     )
@@ -382,13 +426,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 3',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '08:00' => '17:00' },
-        tue: { '08:00' => '17:00' },
-        wed: { '08:00' => '17:00' },
-        thu: { '08:00' => '17:00' },
-        fri: { '08:00' => '17:00' },
-        sat: { '08:00' => '17:00' },
-        sun: { '08:00' => '17:00' },
+        mon: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        sat: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        sun: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -401,7 +466,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar.id,
       first_response_time: 120,
       update_time: 180,
-      close_time: 240,
+      solution_time: 240,
       updated_by_id: 1,
       created_by_id: 1,
     )
@@ -435,13 +500,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 4',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '08:00' => '17:00' },
-        tue: { '08:00' => '17:00' },
-        wed: { '08:00' => '17:00' },
-        thu: { '08:00' => '17:00' },
-        fri: { '08:00' => '17:00' },
-        sat: { '08:00' => '17:00' },
-        sun: { '08:00' => '17:00' },
+        mon: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        sat: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
+        sun: {
+          active: true,
+          timeframes: [ ['08:00', '17:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -454,7 +540,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar.id,
       first_response_time: 120,
       update_time: 180,
-      close_time: 240,
+      solution_time: 240,
       updated_by_id: 1,
       created_by_id: 1,
     )
@@ -492,7 +578,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar.id,
       first_response_time: 120,
       update_time: 180,
-      close_time: 240,
+      solution_time: 240,
       updated_by_id: 1,
       created_by_id: 1,
     )
@@ -588,13 +674,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 5',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '09:00' => '18:00' },
-        tue: { '09:00' => '18:00' },
-        wed: { '09:00' => '18:00' },
-        thu: { '09:00' => '18:00' },
-        fri: { '09:00' => '18:00' },
-        sat: { '09:00' => '18:00' },
-        sun: { '09:00' => '18:00' },
+        mon: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sat: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sun: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -607,7 +714,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar.id,
       first_response_time: 120,
       update_time: 180,
-      close_time: 250,
+      solution_time: 250,
       updated_by_id: 1,
       created_by_id: 1,
     )
@@ -663,13 +770,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 5',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '09:00' => '18:00' },
-        tue: { '09:00' => '18:00' },
-        wed: { '09:00' => '18:00' },
-        thu: { '09:00' => '18:00' },
-        fri: { '09:00' => '18:00' },
-        sat: { '09:00' => '18:00' },
-        sun: { '09:00' => '18:00' },
+        mon: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sat: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sun: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -682,7 +810,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar.id,
       first_response_time: 120,
       update_time: 180,
-      close_time: 240,
+      solution_time: 240,
       updated_by_id: 1,
       created_by_id: 1,
     )
@@ -769,13 +897,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 5',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '09:00' => '18:00' },
-        tue: { '09:00' => '18:00' },
-        wed: { '09:00' => '18:00' },
-        thu: { '09:00' => '18:00' },
-        fri: { '09:00' => '18:00' },
-        sat: { '09:00' => '18:00' },
-        sun: { '09:00' => '18:00' },
+        mon: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sat: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sun: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -788,7 +937,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar.id,
       first_response_time: 120,
       update_time: 180,
-      close_time: 240,
+      solution_time: 240,
       updated_by_id: 1,
       created_by_id: 1,
     )
@@ -891,13 +1040,34 @@ class TicketSlaTest < ActiveSupport::TestCase
       name: 'EU 5',
       timezone: 'Europe/Berlin',
       business_hours: {
-        mon: { '09:00' => '18:00' },
-        tue: { '09:00' => '18:00' },
-        wed: { '09:00' => '18:00' },
-        thu: { '09:00' => '18:00' },
-        fri: { '09:00' => '18:00' },
-        sat: { '09:00' => '18:00' },
-        sun: { '09:00' => '18:00' },
+        mon: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        tue: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        wed: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        thu: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        fri: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sat: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
+        sun: {
+          active: true,
+          timeframes: [ ['09:00', '18:00'] ]
+        },
       },
       default: true,
       ical_url: nil,
@@ -910,7 +1080,7 @@ class TicketSlaTest < ActiveSupport::TestCase
       calendar_id: calendar.id,
       first_response_time: 120,
       update_time: 180,
-      close_time: 240,
+      solution_time: 240,
       updated_by_id: 1,
       created_by_id: 1,
     )