Solved

Objective C code question

Posted on 2012-03-20
1
516 Views
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
0
Comment
Question by:nachtmsk
1 Comment
 
LVL 6

Accepted Solution

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

Open in new window

works as expected...

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

Open in new window

creates a time zone object but isn't set to current system time zone automatically.
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Provisioning an iPhone5 (already exists) 8 1,062
Where to give OSX app's command line parameter in Xcode 4.6 2 872
iphone app 5 433
Alternative of ToolTip in iOS 1 398
CocoaPods is the best way to manage library dependencies in iOS and OS X projects. By using cocoa pods there is no need of downloading the code from github and copying to your project. There are plenty of open source libraries now available with C…
Do you come here a lot? Are you lazy like me and don't want to go through the "trouble" of having to click your Dock's Safari icon and then having to click your Experts Exchange Favorites bookmark to get here? Well then this article is for you.
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question