NKO Atomic Clock

Current time in milliseconds unit, dday remaining time calculator, elapsed time, stopwatch, server time checker

☞ Install NKO Atomic Clock(Android app) at Google Playstore
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https://portal.yonsei.ac.kr/ server time check history

  • 2019-08-27 08:55:12 KST -0.003515
  • 2019-08-27 08:47:25 KST -0.005846
  • 2019-08-27 08:18:04 KST 0.015503
  • 2019-08-27 07:59:26 KST -0.061405
  • 2019-08-27 07:55:16 KST -0.056712
  • 2019-08-27 07:53:44 KST 0.013851
  • 2019-08-10 15:30:11 KST -0.013086
  • 2019-07-11 01:19:07 KST -0.028335
  • 2019-02-25 21:48:15 KST -0.013850
  • 2019-02-25 21:46:55 KST -0.056033
  • Average -0.0209428

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We fetch a server clock and let you see

Webservers transmit their time in seconds unit, so without special treatment, the maximum error would be as big as 1 second. NKO Atomic Clock calculates a server time more than ten times in 1 second and seize the moment when the second changes. Thus we can minimize the calculation error as small as 0.1 second. Moreover, delays between our server and a destination server are considered so the accuracy of time increases.

NKO supports the HTTPS protocol and subdomains

Some servers use different servers over protocols or subdomains. You can get a desired result by specifying more details.


# You need to tell us an exact server address. For example, some sites host differently by whether the address begin with WWW or not.

# Even if your computer clock isn't synchronized, NKO always will display correct time.

# If you click a numeric time error in the history view, the clock will use that measurement.

# The results can have quite much error if the destination server is under load balancing. Please refer to a variance in the server time history information.

# A particular service uses its own time clock, different with web servers' clock. in this case, server time guessing is not meaningful.