Midnight, Monday 20 April: that’s the deadline for electoral register applications from people who want to be able to vote in the general election. Any applications to register after that will be too late to come into force for the general election. You can register online here.
If you’ve recently moved and are on the register at your old address, then there’s a fallback if you miss this deadline – you’ll still be able to vote at your old address, either at your old polling station or via a postal vote. Details of how to apply for a postal vote are here. (You can also get a proxy vote – where someone else votes on your behalf – but postal votes are much easier.)