Nineteen of the European Union's 25 member states were voting in the biggest transnational elections ever held, and the first for the EU since the bloc's expansion into the former communist eastern Europe on May 1.
The voting will only happen on May 1
It never mentioned that it only happen on that one day or if it maybe longer.
( z1 vote :time ( z2 date-entity :day 1 :month 5 :mod ( z3 only ) ) )