If something is up-to-date, it is the newest thing of its kind.
the most up-to-date information available on foods today.
今日有关食物的最新消息。
Web services are always up-to-date and available.
网络服务总是保持最新且随时可用。
If you are up-to-date about something, you have the latest information about it.
We'll keep you up to date with any news.
我们将让你随时了解最新消息。