pool.ntp.org maintains a set of servers all over the world. You can find one just by prefixing your 2-letter country code e.g ch.pool.ntp.org for Switzerland or ca.pool.ntp.org for
Windows w32tm.exe uses a stripped down version of the NTP protocol called SMTP (Simple Mail Transfer Protocol) which is not as accurate as NTP. Further is does not get called often enough to keep the OS (Operating System) clock in sync. One way to improve this is to install a true NTP client. As an extra benefit you also have the option of getting it to use several NTP servers. You could try the free Meinberg NTP software for Linux.
NTP ignores time zones. It works purely in UTC.
GPS satellites contain atomic clocks. They adjust for relativistic effects. They are accurate to a few nanoseconds. Cellphones use GPS to keep their clocks in sync.
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