Time server
時間伺服器(Time Server)
List of time servers
Taiwan servers
- The following services were offered by Nation Standard Time and Frequency Laboratory Telecommunication Laboratories (時間與頻率國家標準實驗室)(last visited: 2007-10-21)
- clock.stdtime.gov.tw
- tock.stdtime.gov.tw
- time.stdtime.gov.tw
- tick.stdtime.gov.tw
- watch.stdtime.gov.tw
- pool.ntp.org: NTP Servers in Taiwan, tw.pool.ntp.org
- 0.tw.pool.ntp.org
- 1.tw.pool.ntp.org
- 2.tw.pool.ntp.org
- 3.tw.pool.ntp.org
- The following services were offered by NTU
- ntp.ntu.edu.tw, 140.112.2.189
- ntp2.ntu.edu.tw, 140.112.4.189
Global servers
- time.nist.gov, time-a.nist.gov, time-b.nist.gov were offered by National Institute of Standards and TechnologyNIST Internet Time Service [Last visited: 2014-04-18]
- time.windows.com
- ntp1.jst.mfeed.ad.jp
- Google Public NTP
- time1.google.com
- time2.google.com
- time3.google.com
- time4.google.com
- Apple NTP server
- Apple 美洲/美國 time.apple.com
- Apple 亞洲 time.asia.apple.com
- Apple 歐洲 time.euro.apple.com
- more on NTP Pool Time Servers
synchronize time
Windows
Configuration snapshot of Windows XP
- Image host on flickr
Linux
console command:
Linux 
- (if ntpdate command is not installed) CentOS Linux Install and Configure NTP to Synchronize The System Clock
- sudo ntpdate ntp_server_url ex: sudo ntpdate clock.stdtime.gov.tw
- Linux 在 CentOS 7 上設定 NTP 自動對時 @ 亂打一通的心情日記 :: 痞客邦 PIXNET :: [Last visited: 2016-11-24]
macOS 
- sudo ntpdate -vu server or IP address Reference: Mac OS X Date & Time Synchronization - Super User
further reading
specification
- NTP（Network Time Protocol / RFC 1305）using SNTP Protocol
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