The European Parliament building in Strasbourg, France | Frederick Florin/AFP via Getty Images 5 percent of Europeans know date of EU election: poll One-third of respondents at least know the vote is in May, according to latest Eurobarometer.

Just 5 percent of Europeans said they know the European Parliament election is set to take place from May 23-26, according to the latest Eurobarometer survey Thursday.

The poll, which surveyed nearly 28,000 people between late February and early March, also found that one-third of respondents know the vote is in May, but could not recall the exact dates.

There were only four EU countries where more than half of respondents said that they would certainly vote in the election: Denmark (65 percent), the Netherlands (62 percent), Sweden (61 percent) and Belgium (58 percent).

Meanwhile, general approval of being part of the bloc has risen to 61 percent among EU27 residents, and is thus back at its "peak level" as last recorded between the fall of the Berlin Wall in 1989 and the adoption of the Treaty on European Union in 1992. An even higher percentage of people in the EU27 (68 percent) said they believe their country has benefited from being an EU member.

Among British respondents, 43 percent said EU membership is a good thing, while 54 percent said their country has benefited from being a member of the EU.

Across the EU27, the survey found that an absolute majority of respondents in 25 countries want to remain in the EU, with Italy, the Czech Republic and the U.K. being the exceptions. Still, in each of these three countries, more people said they would opt to stay than those who said they would vote to leave.