I don't think the threshhold is that significant. The main difference I'd like to see is that we apply the change to timezones, not to the underlying "count num

I don't think the threshhold is that significant. The main difference I'd like to see is that we apply the change to timezones, not to the underlying "count number of seconds" clock. But I think timezones aren't able to be specified to sub-minute precision, so 5 minutes is just as good as 1 minute.