Ghost redirects can be created in JSON or YAML, I did mine with regex and the latter.
You only need one 301 redirect in your redirects.yaml file:
301:
^\/[0-9]+\/[0-9]+\/[0-9]+\/(.+): https://your-domainhere.com/$1This will match the /year/month/day/ (or variation there-of) standard and put the ending part directly to the domain.
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Note: You
may have to restart your Ghost instance to get the redirects to work and try it in a new/different browser (or in incognito/private mode).