No date range target to import to...

I'm on holiday now, so I cannot help you right now. However, a daterange field is supported by Feeds, so I'm not sure why it is not showing up. Maybe the type of field is not "daterange" but something else? Maybe a daterange variant field type?

Can you check what the exact type of field is?

daterange with timezone

It looks like that field type is not provided by Drupal Core, but by the Datetime Range Timezone module → instead. As of now, Feeds only supports mapping targets for fields provided by Drupal Core.
Contrib modules that add new field types, should also provide a FeedsTarget plugin in order for the field to show up on the Feeds mapping page - because that contrib module knows best how the field should be populated.

Am I correct that the field type is from the Datetime Range Timezone module? If so, then this issue can be moved to the issue queue of that project.

Yes, I think that's the problem.

You can close this issue.

Thanks,
Eric

So you don't need a fix for it? Else we can move this issue over to the Datetime Range Timezone module.

For now I'm closing the issue.

No, I don't need a fix, I just used the regular date field...

Thanks,
Eric