Cannot add clock by timezone name or UTC-offset
When I try to add a new clock I have to enter a city for the timezone. This is an issue when I don't have a city but instead a timezone name or offset. For instance, it is common for international conferences to have a deadline listed by a timezone different than the location of the conference (e.g., UTC-12). I end up having to search for a city in the timezone, e.g., using this Wikipedia list, although for some there is no city (such as UTC-12; there are some for UTC+12 which is the same time, but a different date).