Added time function from inverse

src/shared-endpoints.ts

@@ -132,4 +132,12 @@ export default class SharedEndpoints {
     getApiAnnouncements(): GenericAPIResponse {
         return this.requestWrapper.get('v2/public/announcement');
     }
+
+    async getTimeOffset(): Promise<number> {
+        const start = Date.now();
+        return this.getServerTime().then(result => {
+          const end = Date.now();
+          return Math.ceil((result.time_now * 1000) - end + ((end - start) / 2));
+        });
+    }
 }