Show times in the visitor's time zone

As most of our visitors come from around the world and all of our events are online webinars, it would be very helpful if all times displayed get automatically converted to the user's time zone.

At the very least it should be possible to change the timezone from a dropdown (ideally sorted by city names), but an automatic detection would be awesome.

Have seen this in other calendars and it would be a helpful addition for international websites