Section 1 of the European Union (Withdrawal) Act 2019

What advice would my hon. and learned Friend give me to pass on to council candidates for the forthcoming local elections? For two years, they have been telling constituents that we were leaving on 29 March; then it became 12 April. We now have a wipe-clean board in my office so we can fill in the current date that we are leaving. What should our candidates be telling people on the doorstep?