NSDate from unixtime in milliseconds does not work

[ayoze]

Hello,

since you are using [NSDate dateWithTimeIntervalSince1970:(NSTimeInterval)] in the DateConverter class, you need to pass this interval in SECONDS, not millis. Do you prefer to stay with seconds (and change the documentation where you say milliseconds) or /1000 the value? I can send a pull request for the second one.