Handy calculators

Date Difference Calculator

http://www.convertunits.com/dates/

Gestation Calculator

http://americangoatsociety.com/education/gestation_calculator.php

Note:  Mini breeds like Nigerian Dwarf and Pygmy are often 145-150 days.  Minis like Mini Nubian, Mini Lamancha etc are often 145-150 days.  Mine run more at 150 days.  Standard size breeds often are 150-155 days.