There are lots of systems (embedded, mostly offline, abandoned by its vendor) which are not easily upgradeable and their timezone database cannot be easily replaced. Not everything is a PC getting its regular software update.
Jajcus
joined 9 months ago
Most of the time, yes, but not always. Sometimes you actually need local time stored rather than UTC. Simple example: alarm clock. User wants to be waken up at 7:00. No matter if it is summer time or winter time. Even if they travels to a different time zone - still will want to be waken up in the morning. If we store this time as UTC much more unnecessary and error-prone conversions will be needed. Similar issues may arise with other calendar events. Of course, at some point this will be converted to UTC for comparison with actual point in time.