ation of leap years.
      Nevertheless both can be formally extended backward and
      forward in time indefinitely.

      By default <b>timout_c</b> uses the Gregorian Calendar (::GCAL) in the
      determination of the output string.  However, you may
      specify that <b>timout_c</b> use the Julian Calendar (::JCAL) or a
      mixture of both (::MCAL).  If you specify ::MCAL, epochs
      that occur after the beginning of the Gregorian Calendar
      will be represented using the Gregorian Calendar, 