NotImplementedError: DST transitions are not implemented

[zxdavb]

Time zones (TZs) are difficult, but are needed for (e.g.) knowing when daylight savings time (DST) starts & stops.

This library makes much effort to recognize the TZ of each evohome location, but:

• the vendor API appears to use Windows TZs, e.g. Central Europe Standard Time, while
• the library uses IANA TZs internally, e.g. Europe/Budapest

If evohome-async cannot map the location's TZ to a IANA equivalent, it creates a bespoke TZ, and you'll see a warning:

Unable to find IANA TZ identifier for 'RandomStandardTime'; DST support will be very limited

Unfortunately, in these cases it cannot know when DST starts/stops, so if the location has DST enabled, you'll see:

NotImplementedError: DST transitions are not implemented

Workarounds include:

1. switching to a supported TZ, see src/evohome/windows_zones.py, or:
2. disabling DST

[zxdavb]

See a specific example of this behaviour: home-assistant/core#140194

Note that NA/SA TZs have now been added, and South American TZs should now be OK to use.