I released this to CPAN, but it is still in "testing phase" though so it doesn't show up in the metacpan search results yet. It doesn't require XS or a compiler to work. Edit: I just remembered after I went out that unfortunately it requires XS indirectly since it is based on HTML::Make, which uses HTML::Valid::Tagset, which is an XS module.

The date calculation part is based on Date::Calc.

HTML::Make::Calendar is an oddity in that it uses an HTML generator, like a stack of HTML tags, rather than using the template methods which most people seem to prefer.

The HTML in the metacpan version above is slightly odd-looking because of metacpan's style being imposed on it. If you're really really interested about metacpan, see here.

Here is the output of one of the examples from my module:

Since it might be useful I uploaded version 0.01 to CPAN. There is also a list of other modules which I found, so if this one doesn't suit you, those might.