fatal error: Double value cannot be converted to Int because the result would be greater than Int.max [duplicate]

Question

I want to have the integer value of the following floating point value:

var floatingPointValue = NSDate().timeIntervalSince1970 * 1000

I don't care if the integer value of this floating point number is actually an integer or a string.

Answer 1

Int64 is large enough to hold a time interval of some million years measured in milliseconds:

let milliSeconds = Int64(someDate.timeIntervalSince1970 * 1000)
let milliSecondsString = String(milliSeconds)