```ruby
module RelationsHelper

  def format_date_for(relation)
    if relation.from == relation.to
      return "#{relation.from}"
    elsif relation.from.nil?
      return "… - #{relation.to}"
    elsif relation.to.nil?
      return "#{relation.from} - …"
    else
      return "#{relation.from} - #{relation.to}"
    end
  end
end
```

Simplify formatter helper for relation dates
user
```ruby
module RelationsHelper

  def format_date_for(relation)
    return relation.at if relation.transient?
    "#{relation.from || '…'} - #{relation.to || '…'}"
  end
end
```
assistant