Fix issue where it thinks the cron schedule is a valid js date and converts it to a  date.
Fix issue where it thinks the cron schedule is a valid js date and converts it to a  date.

pdilyard/node-schedule,santigimeno/node-schedule,tejasmanohar/node-schedule,bbqsrc/node-schedule,jonhester/node-schedule,andy-g/node-schedule,BirdEggegg/node-schedule,seripap/node-schedule,tempbottle/node-schedule,node-schedule/node-schedule