Consider providing a datepicker for "valid until"

[ocean90]

See preview in https://twitter.com/ocean90/status/980420608822562816.

This (and likely any future feature) would only be available to users of the block editor.

Maybe there should be also some default values like Slack has:

[Peter74]

Hello @ocean90,
how is it with this enhancement?
Looks perfect and also I found questions abut extending time... this will solve it