Convert Date to Integer in Swift - swift

Question

I am updating some of my old Swift 2 answers to Swift 3. My answer to this question, though, is not easy to update since the question specifically asks for NSDate and not Date. So I am creating a new version of that question that I can update my answer for.
Question
If I start with a Date instance like this
let someDate = Date()
how would I convert that to an integer?
Related but different
These questions are asking different things:
Swift convert unix time to date and time
Converting Date Components (Integer) to String
Convert Date String to Int Swift

Answer 1

Date to Int
// using current date and time as an example
let someDate = Date()
// convert Date to TimeInterval (typealias for Double)
let timeInterval = someDate.timeIntervalSince1970
// convert to Integer
let myInt = Int(timeInterval)
Doing the Double to Int conversion causes the milliseconds to be lost. If you need the milliseconds then multiply by 1000 before converting to Int.
Int to Date
Including the reverse for completeness.
// convert Int to TimeInterval (typealias for Double)
let timeInterval = TimeInterval(myInt)
// create NSDate from Double (NSTimeInterval)
let myNSDate = Date(timeIntervalSince1970: timeInterval)
I could have also used `timeIntervalSinceReferenceDate` instead of `timeIntervalSince1970` as long as I was consistent. This is assuming that the time interval is in seconds. Note that Java uses milliseconds.
Note
For the old Swift 2 syntax with NSDate, see this answer.

Answer 2

If you are looking for timestamp with 10 Digit seconds since 1970 for API call then, below is code:
Just 1 line code for Swift 4/ Swift 5
let timeStamp = UInt64(Date().timeIntervalSince1970)
print(timeStamp) <-- prints current time stamp
1587473264
let timeStamp = UInt64((Date().timeIntervalSince1970) * 1000) // will give 13 digit timestamp in milli seconds

Answer 3

timeIntervalSince1970 is a relevant start time, convenient and provided by Apple.
If u want the int value to be smaller, u could choose the relevant start time you like
extension Date{
var intVal: Int?{
if let d = Date.coordinate{
let inteval = Date().timeIntervalSince(d)
return Int(inteval)
}
return nil
}
// today's time is close to `2020-04-17 05:06:06`
static let coordinate: Date? = {
let dateFormatCoordinate = DateFormatter()
dateFormatCoordinate.dateFormat = "yyyy-MM-dd HH:mm:ss"
if let d = dateFormatCoordinate.date(from: "2020-04-17 05:06:06") {
return d
}
return nil
}()
}
extension Int{
var dateVal: Date?{
// convert Int to Double
let interval = Double(self)
if let d = Date.coordinate{
return Date(timeInterval: interval, since: d)
}
return nil
}
}
Use like this:
let d = Date()
print(d)
// date to integer, you need to unwrap the optional
print(d.intVal)
// integer to date
print(d.intVal?.dateVal)