Perl module to calculate birthdate and week numbers for a pregnancy

 Date::Pregnancy can be used to calculate the due date for a pregnancy.
 This module implements 3 different methods for calculating the date of
 birth based on data such as first day of last period (LMP) and average period
 cycle length (APCL).
 .
 The 3 birthdate algorithms available in the module are 266 Days (default), 40
 Weeks, and Count Back.