In Windows, the time zone name that’s available via the standard library is a localized name, not a standard time zone name or abbreviated identifier. For example, if the UI language is Spanish, then “America/New_York” will be either “Hora estándar del Este” (i.e. “Eastern Standard Time”) or “Hora de verano del Este” (i.e. “Eastern Daylight Time”). This applies to time.tzname, time.strftime('%Z'), and datetime.datetime.now().astimezone().tzname().