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...Z.c (https://github.com/wch/r-source/blob/776708efe6003e36f02587ad47b2eaaaa19e2f69/src/extra/tzone/registryTZ.c#L363). I have therefore looked at HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation, to learn that TimeZoneKeyName is set to "UTC". This time zone is not defined in TZtable, but is present in this machine's HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones. (Also, the text of the warning permits the possibility that only the first character of the time zone is used for the warning message -- in the code, a const wchar_t* is used for a %s placeholder...