title: Storing dates in CoreData - Convert date string to NSTimeInterval?
body: <p>So I want to store dates in my CoreData entity and the model indicates the field should be of NSTimeInterval. Not sure why it's not NSDate though as NSTimeInterval sounds... odd. </p>
  
  <p>From my JSON data source I have the following string: "2016-01-28T23:20:00" and I have no idea how to convert this to a NSTimeInterval. I can convert it to NSDate once I figure out the correct format, but that doesnt do much me much good.</p>
  
  <p>Thanks!</p>