I am taking a date from a JSON object in the format of 2012-12-31 and trying to convert it into friendly values and output it.
var redeemableDate = item.
Older Internet Explorer versions (and apparently your version of Safari) won't parse a yyyy-mm-dd string, such as new Date('2012-12-31').
new Date('2012-12-31')
Another option is jQuery.datepicker.parseDate(), although that may be a bit overkill.