iOS Swift Time Format Compare 時間 格式 比較

Swift的時間格式化

1.ViewController.swift

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        //取得日期
        let date = NSDate()
        println(date) //原始
        var formatter = NSDateFormatter();
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss";
        let date2 = formatter.stringFromDate(date);
        
        println(date2) //格式為yyyy-MM-dd HH:mm:ss
        formatter.dateFormat = "yyyy/MM/dd";
        let date3 = formatter.stringFromDate(date);
        println(date3)//格式為yyyy/MM/dd

        //比較時間
        //現在時間
        let date = NSDate()
        let calendar = NSCalendar.currentCalendar()
        let components = calendar.components([.Month, .Day], fromDate: date) //只取月,日
        let dateNow = String(format: "%02d-%02d", components.month, components.day) //NSDate 轉 字串(格式 日-月)
        //自設時間
        let formatter = NSDateFormatter()
        formatter.dateFormat = "MM-dd" //日期格式
        formatter.timeZone = NSTimeZone(name: "UTC")
        let dateSet = "03-29" //自設時間
        
        let dateA = formatter.dateFromString(dateNow)! //字串 轉 NSDate
        let dateB = formatter.dateFromString(dateSet)! //字串 轉 NSDate
        print("DateA:\(dateA)")
        print("DateB:\(dateB)")
        // 比較
        switch dateA.compare(dateB) {
            case .OrderedAscending     :   print("Date A 比 date B 早")
            case .OrderedDescending    :   print("Date A 比 date B 晚")
            case .OrderedSame          :   print("同日")
        }

    }
}

參考來源:
http://www.brianjcoleman.com/tutorial-nsdate-in-swift/
http://iswift.org/cookbook/compare-2-dates