[DannyBee]

Entirely true, but not necessarily relevant.

Local time is a weird thing and changes all the time.

For giggles, look at the history of timezone rule changes in tzdata.

Most timezones have at least one duplicate hour per year (IE the same time occurs twice) in the US as well.

Local times are not an appropriate way to store time.

Note: ISO8601 does not give you local time anyway, since you cannot infer the timezone from the time offset.

[colanderman]

No, that's exactly my point. Sometimes you want an event to occur at 9 AM EST, regardless of how that translates to UTC.

That you cannot infer the timezone from the time offset in ISO 8601 is a good point though.