我是twitter4j的新手，我得到了这个
401:Authentication credentials (https://dev.twitter.com/pages/auth) were missing or incorrect. Ensure that you have set valid consumer key/secret, access token/secret, and the system clock is in sync.
我想知道如何检查系统时钟是否同步？系统时钟和Twitter服务器之间有关系吗？