Chronos is a project mainly written in JavaScript, it's free.
Sync Server and Client Time by Javascript.
浏览器端的时间校准。
http://www.time.ac.cn/stime.asp
http://www.stdtime.gov.tw/chinese/home.aspx
http://simo.blshe.com/post/782/90384
http://en.wikipedia.org/wiki/Chronos
http://zhishi.sohu.com/question/26666665.html
http://www.singtaobooks.com/images/in-Greek.pdf