converting NSDate to NSString creates a memory leak can anyone help.
Here is my code:-
NSDate *today = [[NSDate alloc]init];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"yyyy-MM-dd"];
dateString = nil;
dateString =[[NSString alloc]initWithString:[df stringFromDate:today]];
[df setDateFormat:#"EEEE MMM dd yyyy"];
[dateButton setTitle:[df stringFromDate:today] forState:UIControlStateNormal];
[df release];
[today release];
As you aren't releasing anything the code creates a memory leak.
NSDate *today = [NSDate date]; //Autorelease
NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease]; //Autorelease
[df setDateFormat:#"yyyy-MM-dd"]; // 2017-09-28
dateString = [[df stringFromDate:today] retain];
[df setDateFormat:#"EEEE MMM dd yyyy"]; // Thursday Sep 28 2017
[dateButton setTitle:[df stringFromDate:today] forState:UIControlStateNormal];
For more details, you can refer to Apple's documentation.
Use
NSDate *today = [NSDate date];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"yyyy-MM-dd"];
dateString = [df stringFromDate:today];
[df release]
Using your code...
NSDate *today = [[NSDate alloc]init];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"yyyy-MM-dd"];
dateString = nil;
dateString = [[NSString alloc]initWithString:[df stringFromDate:today]];
...you need to release a lot of obj because nothing is in autorelease.
[today release]; -> alloc
[df release] -> alloc
[dateString release]; -> alloc
Or change to:
NSDate *today = [NSDate date];
NSDateFormatter *df = [NSDateFormatter initWithDateFormat:#"yyyy-MM-dd"];
dateString = [df stringFromDate:today];
with no one release/alloc!
The leak is in the DateFormatter that is not being released.
This should fix the leak :
[df release];
Also, try using ...
[NSDate date]
instead of ...
NSDate* today = [[NSDate alloc] init];
that is a lot of alloc/initing that you are doing there as well... you don't need to alloc/init the NSString either.
You Shoud noy alloc or init NSDate object
Try this Code
NSDate *today = [NSDate date];
NSDateFormatter *dt = [[NSDateFormatter alloc]init];
[dt setDateFormat:#"yyyy-mm-dd"];
NSString *str =[NSString stringWithFormat:#"%#",[dt stringFromDate:today]];
NSLog(#"%#",str);
[dt release];
Happy Coding
Yet another response:
NSDateFormatter *df = [NSDateFormatter initWithDateFormat:#"yyyy-MM-dd"];
NSString *dateString = [df stringFromDate:[NSDate date]];
using ARC, all autoreleased.
Related
i have a date time like this
2012-01-01 10:00:00
i need to convert it into date only like this
2012-01-01
Can anyone help me please
this is my code
NSDate *adate = objIStruct_Conference.m_DtDate;
NSLog(#"DATE========%#",objIStruct_Conference.m_DtDate);
NSString *DateString = [NSString stringWithFormat:#"%#", adate ];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:#"en_US"] autorelease]];
[formatter setDateFormat:#"yyyy:MM:dd"];
NSLog(#"NEW DATE====%#", [formatter stringFromDate:adate]);
[formatter release];
i am getting DATE===== 2012-01-01 10:00:00 , NEW DATE=====(null)
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"yyyy:MM:dd"];
NSLog(#"%#", [formatter stringFromDate:[NSDate date]]);
[formatter release];
See the Class Reference of NSDateFormatter
Please use this code:
NSDateFormatter *dateFormat = [[[NSDateFormatter alloc] init] autorelease];
[dateFormat setDateFormat:#"yyyy-MM-dd"];
NSLog(#"%#",[dateFormat stringFromDate:date]);
it seems your adate pointer would be nil, because it is working perfectly for me on the real device with a valid NSDate but when I set the _date to nil, the output will be nil as in your case.
NSDate *_date = [NSDate date];
NSDateFormatter *_dateFormatter = [[NSDateFormatter alloc] init];
[_dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:#"en_US"]];
[_dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSLog(#"%#", [_dateFormatter stringFromDate:_date]);
the output is:
2012-08-08
I am able to fetch NSString representing the current date and time in PST using the following code.
//get current date and time
NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:#"America/Los_Angeles"];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"MM/dd/yy HH:mm:ss zzz"];
[dateFormatter setTimeZone:timeZone];
NSLocale *enUSPOSIXLocale = [[NSLocale alloc] initWithLocaleIdentifier:#"en_US_POSIX"];
[dateFormatter setLocale:enUSPOSIXLocale];
[enUSPOSIXLocale release];
NSDate *date = [NSDate date];
NSString *currentDateStr = [dateFormatter stringFromDate:date];
NSLog(#"currentDateStr %#",currentDateStr);
[dateFormatter release];
EDIT:
But the following code to fetch NSDate from NSString doesn't serve my purpose.
//get date from string
NSDateFormatter* formatter2 = [[NSDateFormatter alloc] init];
[formatter2 setDateFormat:#"MM/dd/yy HH:mm:ss"];
NSDate *dt = [[NSDate alloc]init];
dt = [formatter2 dateFromString:currentDateStr];
NSLog(#"dt %#",dt);
"dt" appears to be null.
Could anybody help me out in solving this issue of getting NSDate from NSString.
Thanx in advance.
NSDateFormatter also has dateFromString: function.
EDIT:
//get date from string.
NSDateFormatter* formatter2 = [[NSDateFormatter alloc] init];
[formatter2 setDateFormat:#"MM/dd/yy HH:mm:ss zzz"];
NSDate *dt = [formatter2 dateFromString:currentDateStr];
NSLog(#"dt %#",dt);
Make use of
[dateFormatter dateFromString:urString];
In your case urString is currentDateStr
Use
- (NSString *)datePickerValueChangedd:(UIDatePicker*) datePicker{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 50, 68, 68)];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
df.dateStyle = NSDateFormatterMediumStyle;
label.text = [NSString stringWithFormat:#"%#",[df stringFromDate:datePicker.date]];
NSLog(#"I am inside the datePickerValueChanged - - %#", label.text);
[df release];
globalVariable= label.text;
return (label.text);
}
For my iPhone app I got to convert NSDate object to string, and then convert the string back to NSDate object.. Can someone help me out? thank you!
Use to convert from NSDate to NSString
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"yyyy-MM-dd hh:mm:ss a"];
NSString *stringFromDate = [formatter stringFromDate:myNSDateInstance];
Use to convert from NSString to NSDate.
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"yyyy-MM-dd hh:mm:ss a"];
NSDate *myDate = [df dateFromString: stringFromDate];
You need to check out NSDateFormatter this does exactly this, both directions.
convert NSDate to NSString
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"yyyy"];
//Optionally for time zone converstions
[formatter setTimeZone:[NSTimeZone timeZoneWithName:#"..."]];
NSString *stringFromDate = [formatter stringFromDate:myNSDateInstance];
Convert NSString to NSDate
NSString *dateString = #"01-02-2010";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// this is imporant - we set our input date format to match our input string
// if format doesn't match you'll get nil from your string, so be careful
[dateFormatter setDateFormat:#"dd-MM-yyyy"];
NSDate *dateFromString = [[NSDate alloc] init];
// voila!
dateFromString = [dateFormatter dateFromString:dateString];
[dateFormatter release];
I have an array containing the String objects with this format 22/04/2011.My question is that how can I change this string into the yyyy-mm-dd format. I am using NSDateFormatter but it's not working.
The real thing to know that when you convert a string date to NSDate using NSDateFormatter using any of the above mentioned methods, you will always get the NSDate object in Local TimeZone. So when coding the method for date conversion you need to consider this factor.
Hope this helps..
-:samfisher
Try this,
NSDateFormatter *formater = [[NSDateFormatter alloc] init];
[formater setDateFormat:#"dd/mm/yyyy"];
NSDate *date2 = [formater dateFromString:#"22/04/2011"];
[formater setDateFormat:#"yyyy-mm-dd"];
NSString *result = [formater stringFromDate:date2];
NSLog(#"Date - %#",result);
And For Reference - http://iosdevelopertips.com/cocoa/date-formatters-examples-take-3.html
Here how I do this ... This code works ... Try this
NSDate* currentDate = [NSDate date];
NSDateFormatter* df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"yyyy-mm-dd"];
NSString* currentDateString = [df stringFromDate:currentDate];
[df release];
NSDateFormatter *formater = [[NSDateFormatter alloc] init];
[formater setDateFormat:#"dd/mm/yyyy"];
NSDate *date2 = [formater dateFromString:#"2010-11-17"];
[formater setDateFormat:#"yyyy-mm-dd"];
NSString *result = [formater stringFromDate:date2];
I am using the below code:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterFullStyle];
NSDate *today=[NSDate date];
NSString *string = [dateFormatter stringFromDate:today];
NSLog(#"%#",string);
[dateFormatter release];
This will not give me this format 03/20/11 11:24 AM(MONTH/DATE/YEAR HOUR:MIN), if i convert system date and time so the converted string should have such type of information 03/20/11 11:24 AM(MONTH/DATE/YEAR HOUR:MIN).? What should i do?
you should set the date format as,
[dateFormat setDateFormat:#"dd/MM/YYYY hh:mm a"];
Try doing this and u will get the format
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"MM/dd/yy HH:mm"];
NSDate *today=[NSDate date];
NSString *string = [formatter stringFromDate:today];
NSLog(#"%#",string);
[formatter release];
Good Luck!