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I wrote software for medical devices for 3 years. Saying 'just use NTP' is all well and good, except that getting Internet access inside of a hospital is usually impossible. So of course we offered a configurable setting so that they could use an internal or firewall-allowed server. I think one hospital took advantage of that setting. Everybody else was just wrong.

[zdw]

NTP settings can be distributed by DHCP, which in a managed networked environment should be reasonably trustable.

Unfortunately Windows ignores this, and also sets the system clock to a timezone-specific time, not UTC as nearly all other OS's do.

[NelsonMinar]

Configuring every single device to use NTP is a hassle. Do medical devices on an intranet use DHCP? DHCP is capable of handing out NTP server addresses, although I don't think it's very common. Another hacky option would be to override "pool.ntp.org" on the intranet's DNS server so it points to an internal server.

[stewartbutler]

Well, if it could be regulated, you could require that the hospital put the NTP server or equivalent on IP over power line.

[famousactress]

Not sure how old your experience is, but there's increasingly less friction here.