When does the General Data Protection Regulation take effect?

The General Data Protection Regulation (2016/679 EU) (GDPR) is in effect from 25 May 2018 and applies directly in all EU member states, including the UK. When the UK leaves the EU, the GDPR will be incorporated into UK law by the European Union (Withdrawal) Act 2018, so the GDPR standards will continue to apply following Brexit.