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Time synchronization with internet NTP (Network Time Protocol).
For time synchronization of computers via the internet there are some time servers that anybody can access. For example, the PTB (Physikalisch-Technische Bundesanstalt, Germany) operates two servers for this purpose. For automatic synchronization of your system time, the Z-Cron scheduler can query the time server on the Internet and can synchronize your own Windows computer with the atomic time - precise to the second.
The Z-Cron program queries a time server over port 37 via TCP/IP and sets the computer clock if necessary. To use a time server for synchronization with Z-Cron, just select a time server from the list and click save.
 You need access to a time server and you must allow traffic over TCP port 37 in your firewall since the time comparison is carried out via this port.
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