Question

我有一个获取当前时间并将其设置为字符串的基本方法。但是，我怎么能让它格式化当前日期＆amp;自1970年以来的UNIX时间戳格式的时间？

这是我的代码：

NSDate *currentTime = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"hh-mm"];
NSString *resultString = [dateFormatter stringFromDate: currentTime];

是否可以使用NSDateFormatter来更改＆＃39; resultString＆＃39;进入时间戳？

Answer 1

这是我使用的：

NSString * timestamp = [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000];

（1000分钟，毫秒，否则，取出来）

如果您一直在使用它，那么宣布一个宏

可能会很好

#define TimeStamp [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000]

然后这样称呼：

NSString * timestamp = TimeStamp;

或作为一种方法：

- (NSString *) timeStamp {
    return [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000];
}

作为TimeInterval

- (NSTimeInterval) timeStamp {
    return [[NSDate date] timeIntervalSince1970] * 1000;
}

注：

1000是将时间戳转换为毫秒。如果您喜欢以秒为单位的timeInterval，则可以删除它。

夫特

如果你想在Swift中使用全局变量，可以使用：

var Timestamp: String {
    return "\(NSDate().timeIntervalSince1970 * 1000)"
}

然后，你可以称之为

println("Timestamp: \(Timestamp)")

同样，*1000是毫秒，如果您愿意，可以删除它。如果您想将其保留为NSTimeInterval

var Timestamp: NSTimeInterval {
    return NSDate().timeIntervalSince1970 * 1000
}

在任何类的上下文之外声明这些，并且它们可以在任何地方访问。

Answer 2

使用[[NSDate date] timeIntervalSince1970]

Answer 3

- (void)GetCurrentTimeStamp
    {
        NSDateFormatter *objDateformat = [[NSDateFormatter alloc] init];
        [objDateformat setDateFormat:@"yyyy-MM-dd"];
        NSString    *strTime = [objDateformat stringFromDate:[NSDate date]];
        NSString    *strUTCTime = [self GetUTCDateTimeFromLocalTime:strTime];//You can pass your date but be carefull about your date format of NSDateFormatter.
        NSDate *objUTCDate  = [objDateformat dateFromString:strUTCTime];
        long long milliseconds = (long long)([objUTCDate timeIntervalSince1970] * 1000.0);

        NSString *strTimeStamp = [NSString stringWithFormat:@"%lld",milliseconds];
NSLog(@"The Timestamp is = %@",strTimeStamp);
    }

 - (NSString *) GetUTCDateTimeFromLocalTime:(NSString *)IN_strLocalTime
    {
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd"];
        NSDate  *objDate    = [dateFormatter dateFromString:IN_strLocalTime];
        [dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
        NSString *strDateTime   = [dateFormatter stringFromDate:objDate];
        return strDateTime;
    }

注意： - 时间戳必须是UTC区域，所以我将本地时间转换为UTC时间。

Answer 4

如果您想直接在NSDate对象上调用此方法并以毫秒为单位获取时间戳而不包含任何小数位，请将此方法定义为类别：

@implementation NSDate (MyExtensions)
- (NSString *)unixTimestampInMilliseconds
{
     return [NSString stringWithFormat:@"%.0f", [self timeIntervalSince1970] * 1000];
}

Answer 5

//转换为毫秒后，以下方法将返回时间戳。 [退回字符串]

- (NSString *) timeInMiliSeconds
{
    NSDate *date = [NSDate date];
    NSString * timeInMS = [NSString stringWithFormat:@"%lld", [@(floor([date timeIntervalSince1970] * 1000)) longLongValue]];
    return timeInMS;
}

Answer 6

也可以使用

eval

表示时间戳，单位为秒。

Answer 7

为获取当前时间戳

定义宏很方便

class Constant {
    struct Time {
        let now = { round(NSDate().timeIntervalSince1970) } // seconds
    }
}

然后您可以使用let timestamp = Constant.Time.now()

Answer 8

斯威夫特：

我有一个UILabel，可以在Camera Preview上显示TimeStamp。

    var timeStampTimer : NSTimer?
    var dateEnabled:  Bool?
    var timeEnabled: Bool?
   @IBOutlet weak var timeStampLabel: UILabel!

override func viewDidLoad() {
        super.viewDidLoad()
//Setting Initial Values to be false.
        dateEnabled =  false
        timeEnabled =  false
}

override func viewWillAppear(animated: Bool) {

        //Current Date and Time on Preview View
        timeStampLabel.text = timeStamp
        self.timeStampTimer = NSTimer.scheduledTimerWithTimeInterval(1.0,target: self, selector: Selector("updateCurrentDateAndTimeOnTimeStamperLabel"),userInfo: nil,repeats: true)
}

func updateCurrentDateAndTimeOnTimeStamperLabel()
    {
//Every Second, it updates time.

        switch (dateEnabled, timeEnabled) {
        case (true?, true?):
            timeStampLabel.text =  NSDateFormatter.localizedStringFromDate(NSDate(), dateStyle: .LongStyle, timeStyle: .MediumStyle)
            break;
        case (true?, false?):
            timeStampLabel.text = NSDateFormatter.localizedStringFromDate(NSDate(), dateStyle: .LongStyle, timeStyle: .NoStyle)
            break;

        case (false?, true?):
            timeStampLabel.text = NSDateFormatter.localizedStringFromDate(NSDate(), dateStyle: .NoStyle, timeStyle: .MediumStyle)
            break;
        case (false?, false?):
            timeStampLabel.text =  NSDateFormatter.localizedStringFromDate(NSDate(), dateStyle: .NoStyle, timeStyle: .NoStyle)
            break;
        default:
            break;

        }
    }

我正在设置一个设置按钮来触发alertView。

@IBAction func settingsButton(sender : AnyObject) {


let cameraSettingsAlert = UIAlertController(title: NSLocalizedString("Please choose a course", comment: ""), message: NSLocalizedString("", comment: ""), preferredStyle: .ActionSheet)

let timeStampOnAction = UIAlertAction(title: NSLocalizedString("Time Stamp on Photo", comment: ""), style: .Default) { action in

    self.dateEnabled = true
    self.timeEnabled =  true

}
let timeStampOffAction = UIAlertAction(title: NSLocalizedString("TimeStamp Off", comment: ""), style: .Default) { action in

    self.dateEnabled = false
    self.timeEnabled =  false

}
let dateOnlyAction = UIAlertAction(title: NSLocalizedString("Date Only", comment: ""), style: .Default) { action in

    self.dateEnabled = true
    self.timeEnabled =  false


}
let timeOnlyAction = UIAlertAction(title: NSLocalizedString("Time Only", comment: ""), style: .Default) { action in

    self.dateEnabled = false
    self.timeEnabled =  true
}

let cancel = UIAlertAction(title: NSLocalizedString("Cancel", comment: ""), style: .Cancel) { action in

}
cameraSettingsAlert.addAction(cancel)
cameraSettingsAlert.addAction(timeStampOnAction)
cameraSettingsAlert.addAction(timeStampOffAction)
cameraSettingsAlert.addAction(dateOnlyAction)
cameraSettingsAlert.addAction(timeOnlyAction)

self.presentViewController(cameraSettingsAlert, animated: true, completion: nil)

}

Answer 9

    NSDate *todaysDate = [NSDate new];
NSDateFormatter *formatter = [NSDateFormatter new];
[formatter setDateFormat:@"MM-dd-yyyy HH:mm:ss"];
NSString *strDateTime = [formatter stringFromDate:todaysDate];

NSString *strFileName = [NSString stringWithFormat:@"/Users/Shared/Recording_%@.mov",strDateTime];
NSLog(@"filename:%@",strFileName);

日志将是：filename：/ Users / Shared / Recording_06-28-2016 12：53：26.mov

Answer 10

从NSDate Swift 3获取时间戳

func getCurrentTimeStampWOMiliseconds(dateToConvert: NSDate) -> String {
    let objDateformat: DateFormatter = DateFormatter()
    objDateformat.dateFormat = "yyyy-MM-dd HH:mm:ss"
    let strTime: String = objDateformat.string(from: dateToConvert as Date)
    let objUTCDate: NSDate = objDateformat.date(from: strTime)! as NSDate
    let milliseconds: Int64 = Int64(objUTCDate.timeIntervalSince1970)
    let strTimeStamp: String = "\(milliseconds)"
    return strTimeStamp
}

使用

let now = NSDate()
let nowTimeStamp = self.getCurrentTimeStampWOMiliseconds(dateToConvert: now)

获取时间戳格式的当前NSDate

10 个答案: