> That includes DST adjustments, leap second adjustments, and physically moving to different timezones. Does it? My system/bios time is in UTC. The timezone is

> That includes DST adjustments, leap second adjustments, and physically moving to different timezones. Does it? My system/bios time is in UTC. The timezone is not managed for me, when I travel I change it. DST and leap seconds are deltas you add to UNIX epoch. Tracking the number of ticks since epoch is a simpler task, much closer to what a quartz watch attempts to do on its own. Both fail when the battery does, of course. If your end user facing application can't handle 300ms drift that seems like a bug in the application. Even stuff like TOTP generators let you apply a time delta correction and servers usually allow >1 minute drift.