The same author also wrote the defacto standard regex library in Rust, and somewhat recently a new time and date library (jiff).

The comparison between jiff, chrono, time and hifitime is just as good of a read in my opinion: https://github.com/BurntSushi/jiff/blob/HEAD/COMPARE.md

(And they have also written interesting things on regex, non-regex string matching, etc.)

He also wrote the rust CSV parsing library and then the command line utility xsv that uses it. It's an incredible piece of software for breaking down massive CSV files where fields contain linebreaks and you thus cannot use sed to just get ranges of lines.