present in the displayed calender. It uses libtermcap to discover the
proper sequences to turn on bold, or uses overstriking if output is
not to a terminal. If you use two -h options with terminal output,
the date is presented in reverse video instead of bold.
Next we'll have to make the Gregorian gap vary with TZ settings, since
the current method (do it only for September 1752) is decidely
Anglo-centric. ;-P