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I'm playing with Swift for the first time and have some decent programs running under Ubuntu and on a Raspberry Pi but I cannot find a way to measure elapsed time. My first thought is to read the unix time but I cannot see it in any API and haven't figured out the FFI yet.

How should I measure elapsed time in Swift code on Ubuntu and Raspberry Pi?

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    What's wrong with Date? Commented Jan 2, 2018 at 22:04
  • 1
    If you need accurate elapsed time, consider mach_absolute_time as outlined in Technical Q&A 1398. Commented Jan 2, 2018 at 22:20
  • Is NSDate an option? It is mentioned in this answer: Measure elapsed time in swift Commented Jan 2, 2018 at 22:40
  • My answer was converted into a comment so it can't be selected as an answer. That is not right. Commented Jan 2, 2018 at 22:41
  • @absmiths - Effective with Swift 3, we don’t use NSDate anymore. We use Date nowadays. Commented Jan 2, 2018 at 22:42

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C is interoperable with Swift. If you don't want to use Foundation's Date as rmaddy suggested,* you should be able to call the C stdlib's time() function. Just import GlibC first.

*The Unix time from a Date is just Date.timeIntervalSince1970.

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