22 Mar 2019
The Electoral Commission has published a timetable for European Parliamentary elections in Great Britain on their website as part of their contingency planning. For the purposes of this timetable, it is assumed that, should the elections go ahead in the UK, polling day would be Thursday 23 May.
The timetable can be found on the EPE guidance page: https://www.electoralcommission.org.uk/i-am-a/electoral-administrator/european-parliamentary-elections
It is in the resources section under Part B, with the direct link here: