(Card carrying time-nuts member here.)

Yes, I used to have two Cesium standards in my basement, and that allowed me to make FreeBSD the first kernel which could be wrangled to nano-seconds.

These days timekeeping is much more routine and standard hardware, but even if you miss out on LORAN-C and time-by-telephone and leap-seconds, it can still be lots of fun.

Once you get into it, you can look at the log files, call the remote site, and tell them that somebody left the door to the server room open again.

How ?

A temperature difference of 1°C more or less translates to a 1PPM shift (one microsecond per second) in the kind of crystals used for modern motherboard clock chains.

Most air-con systems will oscillate a couple of degrees with approx 20minute period (gentlemen: Tune your PLLs), so a sudden 5 PPM excursion is either a broken air-con or a door left open.

One of the most amazing feats of applied time-nuttery was Steven J. Murdochs work on fingerprinting the timezone of remote servers, based on their TCP sequences numbers.

(Amongst other things, he found out that a lot of Tor nodes were most probably located in north-eastern USA.)

https://dl.acm.org/doi/10.1145/1180405.1180410