Made TimeZone string generation locale-agnostic for Windows Phone and Unity.

Previously, TimeZone string generation that we sent along with
ParseInstallation was dependent upon the `CurrentCulture` of the device
being set to the english locale (as `StandardName` is localized, WHAT?!)

Our new, fancy TimeZone string is now generated agnostically of the
current device locale. There is potential for information about the
specific region of the time zone to be lost here, but most applications
should not require this.

This should fix #138.

Author: richardjrossiii

Parse/Internal/PlatformHooks/Phone/PlatformHooks.Phone.cs

@@ -150,17 +150,12 @@ public string DeviceType {
 
     public string DeviceTimeZone {
       get {
-        // We need the system string to be in english so we'll have the proper key in our lookup table.
-        var culture = Thread.CurrentThread.CurrentCulture;
-        Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
-        string windowsName = TimeZoneInfo.Local.StandardName;
-        Thread.CurrentThread.CurrentCulture = culture;
-
-        if (ParseInstallation.TimeZoneNameMap.ContainsKey(windowsName)) {
-          return ParseInstallation.TimeZoneNameMap[windowsName];
-        } else {
-          return null;
-        }
+        TimeSpan utcOffset = TimeZoneInfo.Local.BaseUtcOffset;
+        return String.Format("GMT{0}{1}:{2:d2}", 
+          offset.TotalSeconds < 0 ? "-" : "+", 
+          Math.Abs(offset.Hours), 
+          Math.Abs(offset.Minutes)
+        );
       }
     }
 

Parse/Internal/PlatformHooks/Unity/PlatformHooks.Unity.cs

@@ -86,17 +86,13 @@ public string DeviceType {
     }
 
     public string DeviceTimeZone {
-      get {
-        try {
-          string windowsName = TimeZoneInfo.Local.StandardName;
-          if (ParseInstallation.TimeZoneNameMap.ContainsKey(windowsName)) {
-            return ParseInstallation.TimeZoneNameMap[windowsName];
-          } else {
-            return null;
-          }
-        } catch (TimeZoneNotFoundException) {
-          return null;
-        }
+      get {
+        TimeSpan utcOffset = TimeZoneInfo.Local.BaseUtcOffset;
+        return String.Format("GMT{0}{1}:{2:d2}",
+          offset.TotalSeconds < 0 ? "-" : "+",
+          Math.Abs(offset.Hours),
+          Math.Abs(offset.Minutes)
+        );
       }
     }
 
@@ -147,6 +143,18 @@ internal static bool IsIOS {
       }
     }
 
+    /// <summary>
+    /// Returns true if the current platform is tvOS.
+    /// </summary>
+    internal static bool IsTvOS {
+      get {
+        if (settingsPath == null) {
+          throw new InvalidOperationException("Parse must be initialized before making any calls.");
+        }
+        return Application.platform == RuntimePlatform.tvOS;
+      }
+    }
+
     /// <summary>
     /// Returns true if current running platform is Windows Phone 8.
     /// </summary>
@@ -230,6 +238,9 @@ private string Load() {
           try {
             if (IsWebPlayer) {
               return PlayerPrefs.GetString("Parse.settings", null);
+            } else if (IsTvOS) {
+              Debug.Log("Running on TvOS, prefs cannot be loaded.");
+              return null;
             } else {
               using (var fs = new FileStream(settingsPath, FileMode.Open, FileAccess.Read)) {
                 var reader = new StreamReader(fs);
@@ -250,6 +261,8 @@ private void Save() {
           if (IsWebPlayer) {
             PlayerPrefs.SetString("Parse.settings", ParseClient.SerializeJsonString(data));
             PlayerPrefs.Save();
+          } else if (IsTvOS) {
+            Debug.Log("Running on TvOS, prefs cannot be saved.");
           } else {
             using (var fs = new FileStream(settingsPath, FileMode.Create, FileAccess.Write)) {
               using (var writer = new StreamWriter(fs)) {