获取时间戳格式的当前NSDate
我有一个基本的方法获取当前时间，并将其设置为一个string。 然而，我怎样才能得到它格式化当前date和时间在一个UNIX自1970年以来的时间戳格式？
这是我的代码：
NSDate *currentTime = [NSDate date]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"hh-mm"]; NSString *resultString = [dateFormatter stringFromDate: currentTime]; 是否有可能使用NSDateFormatter将'resultString'更改为时间戳？
以下是我使用的：
NSString * timestamp = [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000];
（时间1000毫秒，否则取出）
如果您一直在使用它，那么声明一个macros可能会很好
#define TimeStamp [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000]
然后像这样调用它：
NSString * timestamp = TimeStamp;
或者作为一种方法：
- (NSString *) timeStamp { return [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000]; }
作为TimeInterval
- (NSTimeInterval) timeStamp { return [[NSDate date] timeIntervalSince1970] * 1000; }
注意：
1000是将时间戳转换为毫秒。 你可以删除这个，如果你喜欢你的timeInterval在几秒钟内。
迅速
如果你想在Swift中使用全局variables，你可以使用这个：
var Timestamp: String { return "\(NSDate().timeIntervalSince1970 * 1000)" }
那么，你可以打电话给它
println("Timestamp: \(Timestamp)")
再次， *1000是毫秒，如果你愿意的话，你可以删除它。 如果你想保持它作为NSTimeInterval
var Timestamp: NSTimeInterval { return NSDate().timeIntervalSince1970 * 1000 }
在任何课程的上下文之外声明这些内容，并且可以在任何地方访问它们。
使用[[NSDate date] timeIntervalSince1970]
- (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： – 时间戳必须在UTC区，所以我把我们的本地时间转换为UTC时间。
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，而不带任何小数位，请将此方法定义为一个类别：
@implementation NSDate (MyExtensions) - (NSString *)unixTimestampInMilliseconds { return [NSString stringWithFormat:@"%.0f", [self timeIntervalSince1970] * 1000]; }
//以下方法会在转换为毫秒后返回时间戳。 [返回STRING]
- (NSString *) timeInMiliSeconds { NSDate *date = [NSDate date]; NSString * timeInMS = [NSString stringWithFormat:@"%lld", [@(floor([date timeIntervalSince1970] * 1000)) longLongValue]]; return timeInMS; }
也可以使用
@(time(nil)).stringValue);
以秒为单位的时间戳。
定义获取当前时间戳的macros是很方便的
class Constant { struct Time { let now = { round(NSDate().timeIntervalSince1970) } // seconds } }
那么你可以使用let timestamp = Constant.Time.now()
迅速：
我有一个UILabel，它显示相机预览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Button来触发一个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)
}
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：文件名：/ Users / Shared / Recording_06-28-2016 12：53：26.mov
如果你需要时间戳作为一个string。
time_t result = time(NULL); NSString *timeStampString = [@(result) stringValue];
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)
