How to NTP timesync after Wifi connect (and not at boot time)?

[pstein]

There are some guides available on how to NTP timesync a Windows system immediately after bootup.
Read: on how to connect to Internet NTP-Time servers and synchronize local computer time with timezone time.

But what if no internet connection is available at this (boot) time yet?

So what I need is an AUTOMATIC timesync (only/additionally) AFTER a WiFi or other Internet connection is (later) established.

How can I achieve this?

Peter