[racket] date format conversion

From: Neil Van Dyke (neil at neilvandyke.org)
Date: Sat Feb 12 21:40:48 EST 2011

prad wrote at 02/12/2011 08:54 PM:
> my son helped me understand what it was doing after we looked check-expect up.  so this runs a function for you and checks to see that the result is really what you say it is going to be!
> that's pretty useful, so a second thx!

This use of "check-expect" is what's known as *unit testing*, and is a 
very popular practice for good software development nowadays.

You might enjoy the HTDP textbook ("http://htdp.org/"), which teaches 
using tests like these as part of problem-solving process.


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