Convert timestamp string with epochal time and timezone into NSDate - swift

Question

I have a String in following format
"/Date(573465600000-0800)/"
How do I convert this to regular NSDate object?

Answer 1

The first part "573465600000" is the time since the Unix epoch
in milliseconds, and the second part "-0800" is a time zone
specification.
Here is a slight modification of Parsing JSON (date) to Swift
which also covers the time zone part:
extension NSDate {
convenience init?(jsonDate: String) {
let prefix = "/Date("
let suffix = ")/"
let scanner = NSScanner(string: jsonDate)
// Check prefix:
if scanner.scanString(prefix, intoString: nil) {
// Read milliseconds part:
var milliseconds : Int64 = 0
if scanner.scanLongLong(&milliseconds) {
// Milliseconds to seconds:
var timeStamp = NSTimeInterval(milliseconds)/1000.0
// Read optional timezone part:
var timeZoneOffset : Int = 0
if scanner.scanInteger(&timeZoneOffset) {
let hours = timeZoneOffset / 100
let minutes = timeZoneOffset % 100
// Adjust timestamp according to timezone:
timeStamp += NSTimeInterval(3600 * hours + 60 * minutes)
}
// Check suffix:
if scanner.scanString(suffix, intoString: nil) {
// Success! Create NSDate and return.
self.init(timeIntervalSince1970: timeStamp)
return
}
}
}
// Wrong format, return nil. (The compiler requires us to
// do an initialization first.)
self.init(timeIntervalSince1970: 0)
return nil
}
}
Example:
if let theDate = NSDate(jsonDate: "/Date(573465600000-0800)/") {
println(theDate)
} else {
println("wrong format")
}
Output:
1988-03-04 00:00:00 +0000
Update for Swift 3 (Xcode 8):
extension Date {
init?(jsonDate: String) {
let prefix = "/Date("
let suffix = ")/"
let scanner = Scanner(string: jsonDate)
// Check prefix:
guard scanner.scanString(prefix, into: nil) else { return nil }
// Read milliseconds part:
var milliseconds : Int64 = 0
guard scanner.scanInt64(&milliseconds) else { return nil }
// Milliseconds to seconds:
var timeStamp = TimeInterval(milliseconds)/1000.0
// Read optional timezone part:
var timeZoneOffset : Int = 0
if scanner.scanInt(&timeZoneOffset) {
let hours = timeZoneOffset / 100
let minutes = timeZoneOffset % 100
// Adjust timestamp according to timezone:
timeStamp += TimeInterval(3600 * hours + 60 * minutes)
}
// Check suffix:
guard scanner.scanString(suffix, into: nil) else { return nil }
// Success! Create NSDate and return.
self.init(timeIntervalSince1970: timeStamp)
}
}
Example:
if let theDate = Date(jsonDate: "/Date(573465600000-0800)/") {
print(theDate)
} else {
print("wrong format")
}

Answer 2

var date:NSDate = NSDate(timeIntervalSince1970: timeInterval)

Answer 3

let myTimeStamp = "1463689800000.0"
let dateTimeStamp = NSDate(timeIntervalSince1970:Double(myTimeStamp)!/1000) //UTC time
let dateFormatter = NSDateFormatter()
dateFormatter.timeZone = NSTimeZone.localTimeZone() //Edit
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.dateStyle = NSDateFormatterStyle.FullStyle
dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle
let strDateSelect = dateFormatter.stringFromDate(dateTimeStamp)
print(strDateSelect) //Local time
let dateFormatter2 = NSDateFormatter()
dateFormatter2.timeZone = NSTimeZone.localTimeZone()
dateFormatter2.dateFormat = "yyyy-MM-dd"
let date3 = dateFormatter.dateFromString(strDateSelect)
datepicker.date = date3!

Answer 4

Swift 4
let date = Date(timeIntervalSince1970: TimeInterval(1463689800000.0))