CODEWITHSUNDEEP
iosswift
Bryan Hadlock
Bryan Hadlock

Reputation: 2716

Cast from (NSDate) -> NSTimeInterval to unrelated type 'NSTimeInterval always fails

I am trying to get the difference in the time from my iPad to my website, which are both local. Every thing works fine until I get to the line below, which should be taking the iPad time and subtracting the serverTime from it.

self.serverTimeOffSet = NSDate.timeIntervalSinceDate(serverTime) as NSTimeInterval

I get the warning "Cast from (NSDate) -> NSTimeInterval to unrelated type 'NSTimeInterval always fails" and self.serverTimeOffset is never set.

var serverTimeOffSet: NSTimeInterval = 0.0

func setServerOffset(){
    var currentTime = NSDate.timeIntervalSinceReferenceDate()
    var url = NSURL(string: "http://someurl.com/time")
    var request = NSMutableURLRequest(URL:url!)
    var response: NSURLResponse?
    var error: NSError?
    request.HTTPMethod = "get"
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {(response:NSURLResponse!, data:NSData!, error:NSError!) -> Void in
        if (error == nil) {
            var dateString = NSString(data: data, encoding: NSUTF8StringEncoding) as! String
            let dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "YYYY-MM-dd'T'HH:mm:ss"
            dateFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
            if let serverTime = dateFormatter.dateFromString(dateString){
                self.serverTimeOffSet = NSDate.timeIntervalSinceDate(serverTime) as NSTimeInterval
            }
        }
    })
}

Thanks

Edit - Returned date from site:

2015-09-15T00:01:44.8530546-06:00

Upvotes: 0

Views: 738

Answers (2)

Bryan Hadlock
Bryan Hadlock

Reputation: 2716

Well this was stupid,

NSDate().timeIntervalSinceDate(serverTime)

not 

NSDate.timeIntervalSinceDate(serverTime)

Upvotes: 2

Leo Dabus
Leo Dabus

Reputation: 236380

You should also format your date as follow:

let dateString = "2015-09-15T00:01:44.8530546-06:00"
let dateFormatter = NSDateFormatter()
dateFormatter.calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierISO8601)
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSSSxxx"
dateFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
if let serverTime = dateFormatter.dateFromString(dateString){
   serverTime  // "Sep 15, 2015, 3:01 AM"
}

enter image description here

Upvotes: 2

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