NSDate-ISO-8601
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Modified your code to not recreate NSDateFormatter each iteration
Hey, I modified your code to not recreate the NSDateFormatter. In a 2000 iteration test on the dateFromISOStringFormatter method I went from 5.414452016353607 seconds to 3.420518040657043 seconds. Feel free to improve upon further.
http://stackoverflow.com/a/10466498/48062