Batch minfy & gzip new files only with some date tricks

With everybody using grunt.js for linting, css compilation and minification nowadays, I wanted to make a simple experiment and see if I could do the same using a plain batch file – in Windows no less. Turns out some things are very easy and some quite tricky.  While this article is about batch processing of html files, you can apply the same principle for any sort of batch processing in Windows.
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