Auto detect first day of week for calendar

New: Calendar will use systems first day of week when displaying

NzbDrone.Api/System/SystemModule.cs

@@ -42,7 +42,8 @@ namespace NzbDrone.Api.System
                     IsLinux = OsInfo.IsLinux,
                     IsWindows = OsInfo.IsWindows,
                     Branch = _configFileProvider.Branch,
-                    Authentication = _configFileProvider.AuthenticationEnabled
+                    Authentication = _configFileProvider.AuthenticationEnabled,
+                    StartOfWeek = (int)OsInfo.FirstDayOfWeek
                 }.AsResponse();
 
         }

NzbDrone.Common/DateTimeExtensions.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Globalization;
+
+namespace NzbDrone.Common
+{
+    public static class DateTimeExtensions
+    {
+        public static DateTime GetFirstDayOfWeek(this DateTime dayInWeek)
+        {
+            var defaultCultureInfo = CultureInfo.CurrentCulture;
+            return GetFirstDayOfWeek(dayInWeek, defaultCultureInfo);
+        }
+
+        public static DateTime GetFirstDayOfWeek(this DateTime dayInWeek, CultureInfo cultureInfo)
+        {
+            DayOfWeek firstDay = cultureInfo.DateTimeFormat.FirstDayOfWeek;
+            DateTime firstDayInWeek = dayInWeek.Date;
+            while (firstDayInWeek.DayOfWeek != firstDay)
+                firstDayInWeek = firstDayInWeek.AddDays(-1);
+
+            return firstDayInWeek;
+        }
+    }
+}

NzbDrone.Common/EnvironmentInfo/OsInfo.cs

@@ -28,5 +28,13 @@ namespace NzbDrone.Common.EnvironmentInfo
                 return !IsLinux;
             }
         }
+
+        public static DayOfWeek FirstDayOfWeek
+        {
+            get
+            {
+                return DateTime.Today.GetFirstDayOfWeek().DayOfWeek;
+            }
+        }
     }
 }

NzbDrone.Common/NzbDrone.Common.csproj

@@ -66,6 +66,7 @@
     <Compile Include="Composition\Container.cs" />
     <Compile Include="Composition\IContainer.cs" />
     <Compile Include="Composition\ContainerBuilderBase.cs" />
+    <Compile Include="DateTimeExtensions.cs" />
     <Compile Include="EnsureThat\Ensure.cs" />
     <Compile Include="EnsureThat\EnsureBoolExtensions.cs" />
     <Compile Include="EnsureThat\EnsureCollectionExtensions.cs" />

UI/Calendar/CalendarView.js

@@ -21,6 +21,7 @@ define(
                     allDayDefault : false,
                     ignoreTimezone: false,
                     weekMode      : 'variable',
+                    firstDay      : window.NzbDrone.ServerStatus.startOfWeek,
                     timeFormat    : 'h(:mm)tt',
                     header        : {
                         left  : 'prev,next today',