@swift-5.1.5
import Foundation let iso8601WithFractionalSecondFormatter: DateFormatter = { let formatter = DateFormatter() formatter.locale = Locale(identifier: "en_US_POSIX") formatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.SSSSSS" formatter.timeZone = TimeZone(secondsFromGMT: 0) return formatter }() let gregorian = Calendar(identifier: .gregorian) let utc = TimeZone(identifier: "UTC")! let components = gregorian.dateComponents(in: utc, from: Date()) var d = Date(timeIntervalSinceReferenceDate: 0) // 2001年 for _ in 0..<10 { print(gregorian.dateComponents(in: utc, from: d).nanosecond!) d += 0.000001 } d = Date(timeIntervalSinceReferenceDate: 86400 * 365 * 20) // 2021年 for _ in 0..<10 { print(gregorian.dateComponents(in: utc, from: d).nanosecond!) d += 0.000001 }
