libdate-calc-perl 5.4-5 (ia64 binary) in ubuntu feisty

 The package provides a Perl interface to a C library which offers a
 wide variety of date calculations based on the Gregorian calendar
 (the one used in all western countries today), complying with the
 ISO/R 2015-1971 and DIN 1355 standards which specify things as what
 leap years are, when they occur, how the week numbers are defined,
 what's the first day of the week, how many weeks (52 or 53) a given
 year has, and so on.
 .
 Although the Gregorian calendar was only adopted 1582 by most (not
 all) European countries (some countries continued to use the Julian
 calendar until as late as the beginning of the 20th century!), this
 package allows you to extrapolate the Gregorian calendar back until
 the year 1.