 
     endAt = _endAt
 
-    let time = _endAt.timeIntervalSinceReferenceDate - startAt.timeIntervalSinceReferenceDate
+    let time = _endAt - startAt
 
     let isThresholdExceeded: Bool
 


  open var threshold: TimeInterval?

  open var startAt: Date?

  open var endAt: Date?

  public let file: String
  public let function: String


  public struct Result {
    public let name: String
    public let startAt: TimeInterval
    public let endAt: TimeInterval
    public let time: TimeInterval
    public let threshold: TimeInterval?
    public let isThresholdExceeded: Bool
