Search Google by date with new before: and after: search commands

Search Google by date with new before: and after: search commands: Users can now skip the Tools tab and narrow down results from the search bar.

[skills gap before:2020]

[skills gap after:2020-01-31]

[skills gap after:2019-03-01 before:2020-01-31]

Also https://moz.com/learn/seo/search-operators