class Decidim::Meetings::MeetingPresenter

def dates_param

in google calendars event link
joined with '/'. This format is used to generate the dates query param
start time and end time in rfc3339 format removing '-' and ':' symbols 
def dates_param
  return unless meeting
  [meeting.start_time, meeting.end_time].map do |date|
    date.rfc3339.tr("-:", "")
  end.join("/")
end