NSString *dateString = #"20.10.2010";
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:#"dd.MM.yyyy"];
[dateFormatter setLocale:[NSLocale currentLocale]];
NSLog(#"%#", [dateFormatter dateFromString:dateString]);
My output is:
2010-10-19 22:00:00 GMT
Why is one day lost?
Probably because your locale specificies that you're in GMT +2.
That means the given date is interpreted as 2010-10-20 00:00 GMT+2, hence in GMT+0 that's 2010-10-19 22:00.
You not lost 1 day, but 2 hours. But the display is GMT.
What do you want to do with your date ?
See the reference to change the output formatter
Related
i have a problem with method dateFromString, here is my code
NSString* res = [NSString stringWithFormat:#"%#/%#/%#",dateInput.text,monthInput.text,yearInput.text];
NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
[formatter setTimeZone:[NSTimeZone localTimeZone]];
[formatter setDateFormat:#"dd/MM/yy"];
NSDate* inpTime = [formatter dateFromString:res];
[dateResult setText:[NSString stringWithFormat:#"%#",inpTime]];
when I run, the date in "inpTime" always is "dateInput" - 1.
for example: if "dateInput" is 5, the date in "inpTime" will be 4
You need to adjust the timezone.
Change
[formatter setTimeZone:[NSTimeZone localTimeZone]];
to
[formatter setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
This is because you're not setting the time, so it's set by default the midnight UTC.
But when you are displaying the date with a timezone other than UTC the time is shifted accordingly.
As an example if you live in New York the 12/29/2012 00:00:00 UTC is actually the 12/28/2012 18:00:00 for you.
You Code is perfect, no error what so ever.
Try nslogging dateInput.text, monthInput.text and yearInput.text...might be from here you are getting invalid data.
I am displaying time. It will show me :TIME :2012-06-18 23:00:00 +0000
But after using NSDateFormatter I do not know why it is giving me 00:00:00 AM
NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"HH:mm:ss a"];
NSLog(#"TIME :%#",self.startDate);
NSDate *date = [NSDate date];
NSString * _startTime = [dateFormatter stringFromDate:date];
NSLog(#"current time : %#",_startTime);
NSString * _startTime1 = [dateFormatter stringFromDate:self.startDate];
NSLog(#"Start time : %#",_startTime1);
[dateFormatter release];
**Result is**
TIME :2012-06-18 23:00:00 +0000
current time : 17:05:41 PM
Start time : 00:00:00 AM
Your first NSLog outputs the date in GMT time (notice the trailing +0000). An NSDateFormatter object will format the date to the specified time zone. Your NSLog statements show that the stored date in self.startDate is exactly 00:00:00 AM in at least one time zone, and the formatter is set to that time zone. The formatter will default to the time zone for the device. You could set the formatter's timezone to 0 seconds from GMT to see 23:00:00 PM out of your last NSLog statement:
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
How do I convert "4:15:00 PM" to an NSDate? Below is the code I have:
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"HH:mm:ss aa"];
NSDate *date = [df dateFromString:#"4:15:00 PM"];
NSLog(#"date: %#",date);//outputs: 1970-01-01 17:15:00 +0000
//should output: 1970-01-01 16:15:00 +0000
UPDATE: I updated based on responses and I am still having the incorrect show:
NSLog(#"date: %#",[df stringFromDate:date]);//outputs: 12:15:00 PM
//should output: 4:15:00 PM
The question is why does the time change from 4:15:00 PM 12:15:00 PM.
Actually, this is correct.
However, the debugger and NSLog display the time in GMT.
If you want to display local time, use a NSDateFormatter and stringFromDate.
Update:
Your date formatter format is also set incorrectly.
It should be: [df setDateFormat:#"hh:mm:ss aa"]; since you are using a 12 hour clock.
This is because of your locale.
NSDateFormatter outputs a NSDate - which is always in GMT time.
If you want your initial string interpreted as GMT time then you need to include the timezone.
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"HH:mm:ss aa z"];
NSDate *date = [df dateFromString:#"4:15:00 PM GMT"];
I try to display a date with a dateformatter but this one change the year of the date.
This is the method :
setLabelWithDate:(NSdate *)date{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:#"GMT"];
[dateFormatter setTimeZone:gmt];
[dateFormatter setDateFormat:#"dd MMMM YYYY"];
NSLog(#"Date : %#",date);
NSLog(#"stringFromDate %#",[dateFormatter stringFromDate:date]);
self.selectedDateLabel.text = [dateFormatter stringFromDate:date];
[dateFormatter release];
}
And this is what is displayed in the console :
2012-05-04 13:08:50.442 MyAppli[3339:fb03] Date : 2012-12-30 00:00:00 +0000
2012-05-04 13:08:50.443 MyAppli[3339:fb03] stringFromDate 30 December 2013
Here I m. The dateFormatter add myDate one year and I really don't know why. This case happens only for the 2 last dates of the year (30 and 31 december).
Thanks for your help.
Alexandre
Use
[dateFormatter setDateFormat:#"dd MMMM yyyy"]; // lowercase y
and you probably should check this and this.
I have a method,
+ (NSDate *) convertToDateFrom:(NSString *) dateString
{
if (dateString == nil || [dateString isEqual:#""]) return nil; //return nil if dateString is empty
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"EEEE, dd MMMM yyyy HH:mm"];
NSDate *date = [df dateFromString:dateString];
return date;
}
When I pass,
#"Monday, 21 November 2011 17:01" //Passed string
It returns a wrong date,
2011-11-21 23:14:00 +0000 // Output
I am not sure whether I am using those flags correctly or NSDateFormatter isn't properly converting my string to date.
Am I doing something wrong?
Thanks
The +0000 at the end of the date indicates GMT. All dates are stored relative to GMT; when you convert a date to a string or vice versa using a date formatter, the offset to your time zone is included. You can use NSDateFormatter's -setTimeZone: method to set the time zone used.
In short, you're not doing anything wrong in your code. Use [df stringFromDate:date]; to see that the date is correct. (You can also use NSDate's -descriptionWithCalendarFormat:timeZone:locale:.)
try using
df stringFromDate:date
Following worked on mine,
NSLog(#"Date for locale %#: %#",
[[dateFormatter locale] localeIdentifier], [df stringFromDate:date]);
gave me output as :
Date for locale en_US: Wednesday, 26 June 2013 15:50
Try setting the time zone and locale.
[df setLocale:[NSLocale currentLocale]];
[df setTimeZone:[NSTimeZone systemTimeZone]];