Calendar events often want to be interpreted according to whatever the local timezone currently is. For instance "10am every second Sunday" shouldn't adjust to 9am during Daylight-Savings time. And my 7am alarm clock should definitely not change to 7pm because I flew from Aotearoa to England.
I'm sure it's been discussed here before, but for calendar events you don't necessarily want a timezone attached, you want a location - "this event happens at 9am according to whatever timezone is currently in effect in Auckland, NZ". That's a thing that UTC or timezone-aware Datetimes can't help with.
I'm sure it's been discussed here before, but for calendar events you don't necessarily want a timezone attached, you want a location - "this event happens at 9am according to whatever timezone is currently in effect in Auckland, NZ". That's a thing that UTC or timezone-aware Datetimes can't help with.