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Objective C code question

Posted on 2012-03-20
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Last Modified: 2016-02-10
Hi,
I'm working my way through a book on Obj C. Please look at the code below and my explanation and tell me why my results are not the same with using the Class and Instance methods.
---
If I use the class method of systemTimeZone it's telling me (I think) that I am on Daylight savings time.
However, If I use an instance method for isDaylightSavingTime I am getting a 0 returned.
Help?

Thanks

nacht

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];





NSTimeZone *zone = [[NSTimeZone alloc] init]; // Create an instance

NSTimeZone *c = [NSTimeZone systemTimeZone]; // Class method so don't need to create an instance

NSLog(@"Time zone is %@\n", c);

BOOL z =[zone isDaylightSavingTime];


NSLog(@"Is it set to Daylight Savings time: %d\n", z);


[pool drain];
return 0;
}


OUTPUT:
2012-03-20 11:05:02.525 TimeZone[1259:903] Time zone is US/Eastern (EDT) offset -14400 (Daylight)
2012-03-20 11:05:02.526 TimeZone[1259:903] Is it set to Daylight Savings time: 0
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Question by:nachtmsk
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Accepted Solution

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leuqarte earned 500 total points
ID: 37813813
NSTimeZone *c = [NSTimeZone systemTimeZone]; 

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works as expected...

NSTimeZone *zone = [[NSTimeZone alloc] init];

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creates a time zone object but isn't set to current system time zone automatically.
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