chrono
                                
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                        doc revision
rewording and other fixes to the documentation of src/lib.rs and
a related file
does this PR meet eligibility criteria for review?
I think there's something wrong about the coding format, since it doesn't pass the lint check. I suggest you run cargo fmt -- --check --color=always to see which lines are wrong. I met the same problem with my own PR when contributing.
I'll look into this soon.