Current and Updating time in iOS?

Question

i'm developing a tool for car driving which saves GPS Data, Accelerometer Data and Time for later use.

Acceleration is the least Priority, though.

All i need is a little code example so i can get the current system time printed as an updating clock in Xcode because i want it to save my data as fast and as often as possible :>

Thanks in advance for any answers :)

h4wkeye

score 16 · Accepted Answer · answered Apr 12 '11 at 10:42

16

To get the current system time use

NSDate* currentDate = [NSDate date];

and To get the string representation of NSDate

- (NSString *)description

Then Use below

NSString* dateInString = [currentDate description];

answered Apr 12 '11 at 10:42

Jhaliya - Praveen Sharma

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How do i add this? i'm pretty new to xCodeand i eed to know what of this is typed into the header and what into the source...sorry if it's much to ask :> – h4wkeye Apr 12 '11 at 10:53
@Jhaliya So where to implement which of the lines? a dumb question i guess but i won't learn without asking :> – h4wkeye Apr 12 '11 at 11:02
@h4wkeye: you need to put the in code in source file ... i would suggest to read objective-C doc's provided by Apple .. will be much helpful for you in the beginning ... – Jhaliya - Praveen Sharma Apr 12 '11 at 11:04
@Jhaliya Thanks :) Only the first Line of your Code is working though, second line gives me "description" undeclared, third one says "expected ; at the end" – h4wkeye Apr 12 '11 at 11:08
@h4wkeye: Use as below NSDate* currentDate = [NSDate date]; NSString* dateInString = [currentDate description]; NSlog(@"System Current %@", dateInString); – Jhaliya - Praveen Sharma Apr 12 '11 at 11:42
@Jhaliya i need GMT +2 though :/ – h4wkeye Apr 12 '11 at 12:03
Edit it's not GMT but its 2 hrs back, 14.10 here but clock says 12:10 :/ – h4wkeye Apr 12 '11 at 12:10
@h4wkeye Plz look into the below SO post for getting date in GMT http://stackoverflow.com/questions/1490537/gmt-time-on-iphone – Jhaliya - Praveen Sharma Apr 12 '11 at 12:16
@Jhaliya i can#t get that stuff inside your link to work, is there no way to just set the friggin time to +0200? i know this preference is located inside "description" but how do i change it? D: – h4wkeye Apr 12 '11 at 13:01

score 11 · Answer 2 · edited Nov 13 '11 at 08:15

Like to share this simple code example. Just put this any where in your myClass code. You May find more formatting examples > Format String for the iPhone NSDateFormatter.

// Get current date time

NSDate *currentDateTime = [NSDate date];

// Instantiate a NSDateFormatter

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

// Set the dateFormatter format

//[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

// or this format to show day of the week Sat,11-12-2011 23:27:09

[dateFormatter setDateFormat:@"EEE,MM-dd-yyyy HH:mm:ss"];

// Get the date time in NSString

NSString *dateInStringFormated = [dateFormatter stringFromDate:currentDateTime];

NSLog(@"%@", dateInStringFormated);

// Release the dateFormatter

[dateFormatter release];

score 3 · Answer 3 · answered Oct 24 '13 at 08:52

Use this code in viewDidLoad or viewWillAppear

-(void)callUpdate
{
NSTimer *timer = [[NSTimer alloc]initWithFireDate:[NSDate date] interval:0.1 target:self     selector:@selector(updateTimer) userInfo:nil repeats:YES];

}
-(void)updateTimer
{
NSDateFormatter *dateformatter=[[NSDateFormatter alloc]init];

[dateformatter setDateFormat:@"MM-dd-yyyy HH:mm:ss"];

NSString *dateInStringFormated=[dateformatter stringFromDate:[NSDate date]];
label.text = dateInStringFormated;

}

or else just alloc the timer in the viewDidLoad or viewWillAppear and when you need to stop the timer use

[timer invalidate];

Current and Updating time in iOS?

3 Answers3