I am writing a racing app and want to convert a large number of milliseconds into minutes:seconds.milliseconds (for example, 1:32.361
). At the moment I just do it through maths (minutes / 60000
), then get remainder and divide further, etc., but i find that it is off every now and then by 1 millisecond. I know this might not sound like a big deal, but I tried to find the average of 1:32.004
and 1:32.004
and it returned 1:32.003
, which means it gets put in incorrectly and the rest of the app can't deal with it.
Is there a way to use NSDate
or NSDateFormatter
or something like that to format the milliseconds into MM:ss.mmm?
I have looked at these sources but not found the answer:
How to convert milliseconds into minutes?
Convert seconds into minutes and seconds
Convert milliseconds to minutes
http://www.codingexplorer.com/swiftly-getting-human-readable-date-nsdateformatter/
You can create a TimeInterval extension to format your elapsed time as follow:
Xcode 11.4 • Swift 5.2 or later
extension TimeInterval {
var hourMinuteSecondMS: String {
String(format:"%d:%02d:%02d.%03d", hour, minute, second, millisecond)
}
var minuteSecondMS: String {
String(format:"%d:%02d.%03d", minute, second, millisecond)
}
var hour: Int {
Int((self/3600).truncatingRemainder(dividingBy: 3600))
}
var minute: Int {
Int((self/60).truncatingRemainder(dividingBy: 60))
}
var second: Int {
Int(truncatingRemainder(dividingBy: 60))
}
var millisecond: Int {
Int((self*1000).truncatingRemainder(dividingBy: 1000))
}
}
extension Int {
var msToSeconds: Double { Double(self) / 1000 }
}
let seconds = 131.531 // 131.531
let time = seconds.minuteSecondMS // "2:11.531"
let millisecond = seconds.millisecond // 531
let ms = 1111
let sec = ms.msToSeconds.minuteSecondMS // "0:01.111"
Date().description(with: .current) // "Wednesday, October 21, 2020 at 5:44:51 PM Brasilia Standard Time"
let startOfDay = Calendar.current.startOfDay(for: Date())
let secondsFromStartOfDay = Date().timeIntervalSinceReferenceDate - startOfDay.timeIntervalSinceReferenceDate
secondsFromStartOfDay.hourMinuteSecondMS // "17:44:51.705"
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