I have a basic method which gets the current time and sets it in a string. However, how can I get it to format the current date & time in a UNIX since-1970 timestamp format?
Here is my code:
NSDate *currentTime = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"hh-mm"];
NSString *resultString = [dateFormatter stringFromDate: currentTime];
Is it possible to use NSDateFormatter to change the 'resultString' into a timestamp?
This question is related to
cocoa
cocoa-touch
nsdate
nsdateformatter
unix-timestamp
Here's what I use:
NSString * timestamp = [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000];
(times 1000 for milliseconds, otherwise, take that out)
If You're using it all the time, it might be nice to declare a macro
#define TimeStamp [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000]
Then Call it like this:
NSString * timestamp = TimeStamp;
Or as a method:
- (NSString *) timeStamp {
return [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000];
}
As TimeInterval
- (NSTimeInterval) timeStamp {
return [[NSDate date] timeIntervalSince1970] * 1000;
}
NOTE:
The 1000 is to convert the timestamp to milliseconds. You can remove this if you prefer your timeInterval in seconds.
Swift
If you'd like a global variable in Swift, you could use this:
var Timestamp: String {
return "\(NSDate().timeIntervalSince1970 * 1000)"
}
Then, you can call it
println("Timestamp: \(Timestamp)")
Again, the *1000 is for miliseconds, if you'd prefer, you can remove that. If you want to keep it as an NSTimeInterval
var Timestamp: NSTimeInterval {
return NSDate().timeIntervalSince1970 * 1000
}
Declare these outside of the context of any class and they'll be accessible anywhere.
If you need time stamp as a string.
time_t result = time(NULL);
NSString *timeStampString = [@(result) stringValue];
- (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;
}
NOTE :- The Timestamp must be in UTC Zone, So I convert our local Time to UTC Time.
It's convenient to define a macro for get current timestamp
class Constant {
struct Time {
let now = { round(NSDate().timeIntervalSince1970) } // seconds
}
}
Then you can use let timestamp = Constant.Time.now()
Can also use
@(time(nil)).stringValue);
for timestamp in seconds.
Swift:
I have a UILabel which shows TimeStamp over a Camera Preview.
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;
}
}
I am setting up a setting Button to trigger a 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)
}
use [[NSDate date] timeIntervalSince1970]
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);
Log will be : filename:/Users/Shared/Recording_06-28-2016 12:53:26.mov
If you'd like to call this method directly on an NSDate object and get the timestamp as a string in milliseconds without any decimal places, define this method as a category:
@implementation NSDate (MyExtensions)
- (NSString *)unixTimestampInMilliseconds
{
return [NSString stringWithFormat:@"%.0f", [self timeIntervalSince1970] * 1000];
}
// The following method would return you timestamp after converting to milliseconds. [RETURNS STRING]
- (NSString *) timeInMiliSeconds
{
NSDate *date = [NSDate date];
NSString * timeInMS = [NSString stringWithFormat:@"%lld", [@(floor([date timeIntervalSince1970] * 1000)) longLongValue]];
return timeInMS;
}
To get timestamp from NSDate Swift 3
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
}
To use
let now = NSDate()
let nowTimeStamp = self.getCurrentTimeStampWOMiliseconds(dateToConvert: now)
Source: Stackoverflow.com