How to parse "MongoDB datetime (ISO Date)" to NSDate on iOS (swift and objective-c)

Swift

  func stringToDate(date:String) -> NSDate {  let formatter = NSDateFormatter()  // Format 1  formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"  if let parsedDate = formatter.dateFromString(date) {    return parsedDate  }  // Format 2  formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:SSSZ"  if let parsedDate = formatter.dateFromString(date) {    return parsedDate  }  // Couldn't parsed with any format. Just get the date  let splitedDate = date.componentsSeparatedByString("T")  if splitedDate.count > 0 {    formatter.dateFormat = "yyyy-MM-dd"    if let parsedDate = formatter.dateFromString(splitedDate[0]) {      return parsedDate    }  }  // Nothing worked!  return NSDate().toLocalTime()}

Objective-C

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSSZ"];NSDate *date = [dateFormat dateFromString:@"2015-06-11T14:16:56.643Z"];

Formats:

// Format 1, 12Hour Style"yyyy-MM-dd'T'HH:mm:ss.SSSZ"2016-02-12T10:01:31.000+0000// Format 2, 24Hour Style"yyyy-MM-dd'T'HH:mm:SSSZ"2016-02-12T10:01:31Z

Swift 3 update of @fatihyildizhan's answer:

func stringToDate(date: String) -> Date {    let formatter = DateFormatter()    // Format 1    formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"    if let parsedDate = formatter.date(from: date) {        return parsedDate    }    // Format 2    formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:SSSZ"    if let parsedDate = formatter.date(from: date) {        return parsedDate    }    // Couldn't parsed with any format. Just get the date    let splitedDate = date.components(separatedBy: "T")    if splitedDate.count > 0 {        formatter.dateFormat = "yyyy-MM-dd"        if let parsedDate = formatter.date(from: splitedDate[0]) {            return parsedDate        }    }    // Nothing worked!    return Date()}

As of iOS 10+, there is now an ISO8601DateFormatter.

https://developer.apple.com/reference/foundation/iso8601dateformatter

HOWEVER ... it doesn't handle the decimal seconds that you sometimes get from MongoDB date strings, here's a simple work-around:

ISO8601DateFormatter doesn't parse ISO date string