• 主要知识点

Date 类

DateFormatter 类

• 实现代码

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let date = Date()
        let timeFormatter = DateFormatter()
        //日期显示格式，可按自己需求显示
        timeFormatter.dateFormat = "yyy-MM-dd' at 'HH:mm:ss.SSS"
        let strNowTime = timeFormatter.string(from: date) as String
        print(strNowTime)
    }

• 运行结果

2017-02-12 at 22:43:34.664