Implement timezone in targets (#47)

* Implement timezone in targets

* Allow timezone to be nullable

src/target/java_android.cr

@@ -629,6 +629,7 @@ END
                 put("width", size.x);
                 put("height", size.y);
             }});
+            device.put("timezone", Calendar.getInstance().getTimeZone().getID());
             SharedPreferences pref = context().getSharedPreferences("api", Context.MODE_PRIVATE);
             if (pref.contains("deviceId"))
                 device.put("id", pref.getString("deviceId", null));

src/target/swift_ios.cr

@@ -162,6 +162,7 @@ END
             }
 
             device["language"] = Locale.preferredLanguages[0]
+            device["timezone"] = TimeZone.current.identifier
             if let currentId = deviceId {
                 device["id"] = currentId
             }

src/target/typescript_nodeclient.cr

@@ -57,13 +57,14 @@ END
       language: null,
       screen: null,
       platform: null,
-      version: null
+      version: null,
+      timezone: null
     };
     if (this.deviceId)
       device.id = this.deviceId;
     return device;
   }
-  
+
   private async makeRequest({name, args}: {name: string, args: any}) {
     const deviceData = this.device();
     const body = {

src/target/typescript_nodeserver.cr

@@ -37,6 +37,7 @@ interface DBDevice {
     language: string
     lastActiveAt?: Date
     push?: string
+    timezone?: string | null
 }
 
 interface DBApiCall {

src/target/typescript_web.cr

@@ -85,7 +85,8 @@ async function device() {
       height: screen.height
     },
     version: me ? me.src : "",
-    language: navigator.language
+    language: navigator.language,
+    timezone: typeof Intl === "object" ? Intl.DateTimeFormat().resolvedOptions().timeZone : null
   };
   const deviceId = getDeviceId();
   if (deviceId)