显然，IERS 宣布了闰秒的截止日期为今年 6 月 30 日午夜。
CentOS/RHEL 5.4 是否正确更新以支持/过渡更新的 NTP 系统？我的印象是它需要更新的 tzdata 包，但不确定。
我检查了 tzdata 包的更改日志并注意到以下内容：
* Tue Feb 27 2007 Petr Machata <pmachata@redhat.com> - 2007c-1
- Upstream 2007c
- Pulaski County, Indiana, switched back to eastern time.
- Turkey switches at 01:00 standard time, not at 01:00 UTC.
- Upstream 2007b
- Changes to the commentary in "leapseconds".
- Resolves: #230089
* Tue Aug 22 2006 Petr Machata <pmachata@redhat.com> - 2006j-1
- Upstream 2006j
- Honduras stopped observing …