Hi all,

Do we consider the CLI help/usage message as part of the publicly documented 
API?

Background: There's a bug in the help/usage message in some of the Kafka CLI 
tools. For some of the tools that accept a timestamp, the help message 
instructs the user to provide a date in a 'YYYY-MM-DDTHH:mm:SS.sss' format.

However, that format is incorrect:

- YYYY refers to the "week year" not the year (see 
https://medium.com/@dangoldin/javas-simpledateformat-yyyy-vs-yyyy-f3e785523589)
- SS refers to milliseconds, not seconds
- sss refers to seconds, not milliseconds

It's a small thing, but it did lead to some confusion and it would be good to 
clean it up.

Thanks,
Kirk

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