ArgumentOutOfRangeException when calling TimeZoneService.SpecifyTimeZone

[calbot]

If I do something like this for "New Zealand Standard Time"

var tz = TimeZoneService.FindSystemTimeZoneById("New Zealand Standard Time");
var gregorian = DateTimeOffset.Now;
gregorian = TimeZoneService.SpecifyTimeZone(gregorian, var);

I get an exception ArgumentOutOfRangeException

{"Year, Month, and Day parameters describe an un-representable DateTime."}

   at System.DateTime.DateToTicks(Int32 year, Int32 month, Int32 day)
   at System.DateTime..ctor(Int32 year, Int32 month, Int32 day, Int32 hour, Int32 minute, Int32 second, Int32 millisecond, DateTimeKind kind)
   at TimeZones.Internal.TimeZoneInfoEx.FromSystemTime(SYSTEMTIME systemTime)
   at TimeZones.Internal.TimeZoneInfoEx.IsDaylightTime(DateTime date, TIME_ZONE_INFORMATION& tzi)
   at TimeZones.Internal.TimeZoneInfoEx.ConvertTime(DateTimeOffset dateTimeOffset)
   at TimeZones.TimeZoneService.TimeZoneEx.ConvertTime(DateTimeOffset dateTimeOffset)
   at TimeZones.TimeZoneService.SpecifyTimeZone(DateTimeOffset dateTimeOffset, ITimeZoneEx timeZone)

Running on Windows 10 as a Windows 8.1 app.