NSDate is not transformed correctly - iphone

Question

I am trying to transform a datestring into another format. I am doing it like this.
NSLog(#"datestring is NOW %#",_dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"YYYY-MM-DD"];
NSDate *date = [dateFormat dateFromString:_dayObject.p_date];
NSLog(#"date transformed %#",date);
[dateFormat setDateFormat:#"EEEE, dd/MM/YYYY"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"GMT"]];
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(#"datestring is AFTER %#",dateStr);
But this is what I get from my NSLOGs
2013-04-18 08:43:36.181 mosaqua2[9629:907] datestring is NOW 2013-05-04
2013-04-18 08:43:36.184 mosaqua2[9629:907] date transformed 2013-01-03 23:00:00 +0000
2013-04-18 08:43:36.184 mosaqua2[9629:907] datestring is AFTER donderdag, 03/01/2013
What I want it to be is
Saterday, 04/05/2013
Can anybody help me ?

Answer 1

Use my this bellow custom method for convert Date Format ...
-(NSString *)changeDateFormat:(NSString*)stringDate dateFormat:(NSString*)dateFormat getwithFormat:(NSString *)getwithFormat{
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:dateFormat];
NSDate *date = [dateFormatter dateFromString:stringDate];
dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:getwithFormat];
NSString *convertedString = [dateFormatter stringFromDate:date];
NSLog(#"Converted String : %#",convertedString);
return convertedString;
}
and use it like bellow...
NSString *strSDate = [self changeDateFormat:_dayObject.p_date dateFormat:#"yyyy-MM-dd" getwithFormat:#"EEEE, dd/MM/yyyy"];
NSLog(#"datestring is AFTER %#",strSDate);
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Answer 2

Check this.....
NSLog(#"datestring is NOW ==>> %#", _dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-dd"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"GMT"]];
NSDate *date = [dateFormat dateFromString: _dayObject.p_date];
NSLog(#"date transformed ==>> %#",date);
[dateFormat setDateFormat:#"EEEE, dd/MM/yyyy"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"GMT"]];
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(#"datestring is AFTER ==>> %#",dateStr);
OUTPUT:~
datestring is NOW ==>> 2013-05-04
date transformed ==>> 2013-05-04 00:00:00 +0000
datestring is AFTER ==>> Saturday, 04/05/2013

Answer 3

Check the character case of parameters
NSLog(#"datestring is NOW %#",_dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-dd hh:mm:ss"]; //MODIFIED
NSDate *date = [dateFormat dateFromString:_dayObject.p_date];
NSLog(#"date transformed %#",date);
[dateFormat setDateFormat:#"EEEE, dd/MM/yyyy"]; //MODIFIED
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(#"datestring is AFTER %#",dateStr);

Answer 4

Please try ..this it will work to get the week name
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"eeee"];
NSCalendar * cal = [NSCalendar currentCalendar];
NSUInteger numWeekdays = [cal maximumRangeOfUnit:NSWeekdayCalendarUnit].length;
NSDateComponents * comp = [[NSDateComponents alloc] init];
for( NSUInteger day = 1; day <= numWeekdays; day++ ){
[comp setWeekday:day];
[comp setWeek:0];
NSDate * date = [cal dateFromComponents:comp];
NSString * dayName = [dateFormat stringFromDate:date];
NSLog(#"%#", dayName);
}

Answer 5

You are doing all right except setTimeZone , comment that you will get your output.
NSLog(#"datestring is NOW %#",_dayObject.p_date);
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"YYYY-MM-DD"];
NSDate *date = [dateFormat dateFromString:_dayObject.p_date];
NSLog(#"date transformed %#",date);
[dateFormat setDateFormat:#"EEEE, dd/MM/YYYY"];
//[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:#"GMT"]]; //NOT NEEDED
NSString *dateStr = [dateFormat stringFromDate:date];
NSLog(#"datestring is AFTER %#",dateStr);

Answer 6

Change this : "YYYY"
To : "yyyy"
Reason for the error,
It's a common mistake to use YYYY. yyyy specifies the calendar year
whereas YYYY specifies the year (of “Week of Year”), used in the ISO
year-week calendar. In most cases, yyyy and YYYY yield the same
number, however they may be different. Typically you should use the
calendar year.