title: Basic calendar display in R
body: <p>Is there a basic calendar display in R, like Unix's <code>cal</code> program?</p>
  
  <p>I realize it's not that hard to wrap the base date/time functions (like <code>weekdays</code>, <code>seq.date</code>, etc.), but I feel like I'm ignorant of something pretty basic that may be solved in one of the outstanding time/date packages that already exist.  Moreover, it always starts simply enough: assign days of the week, but then one gets to leap years, layout for calendars spanning multiple months (though I'd settle for just printing 1 month), and so on.</p>
  
  <p>My current usage involves switching out of R to Linux or a calendar program in Windows.  Doing this in R would be easier.</p>
  
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  <p>Note 1.  I've looked at some of the various widgets available for Gtk2 and TclTk - for some reason, installation of supporting systems is not working out well (and I think it's serious overkill, nor is it very good from a portability perspective to have such dependencies).  In Windows, I've even tried Cygwin, to access <code>cal</code>, but that installation seems to be conflicting with Rtools.  In short, adding layers of stuff is not a particularly productive avenue at the moment.  :)  I've not found any solutions in lubridate, xts, zoo, and other packages, though I may have missed something. </p>