On Wed, Jul 27, 2016 at 3:58 PM, Georgi Guninski
   <[1]guninski@guninski.com> wrote:

     Getting very good approximation of system time from a browser is not
     very trivial, but likely writing something like NTP in javascript is
     doable.

   Haven't tried it, but this JS library claims to return
   microsecond-resolution system time in a vareity of browsers:
   [2]https://github.com/medikoo/microtime-x

References

   1. mailto:guninski@guninski.com
   2. https://github.com/medikoo/microtime-x