Adding and subtracting from dates
test date: Wed May 11 2011 02:40:18 GMT+0000 (Coordinated Universal Time) test date + 1 week: Wed May 18 2011 02:40:18 GMT+0000 (Coordinated Universal Time) one year earlier: Tue May 11 2010 02:40:18 GMT+0000 (Coordinated Universal Time)