I am trying to convert nsstring to nsdate and then to the systemtimezone. Is my code right? Any help appreciated.
NSString *str=@"2012-01-15 06:27:42";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehaviorDefault];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *dateFromString = [dateFormatter dateFromString:str];
NSDate* sourceDate = dateFromString;
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT-07:00"];
NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;
NSDate* destinationDate = [[[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate] autorelease];
bottomLabel2.text=[NSString stringWithFormat:@"- %@ -",destinationDate];
The code result is 2012-01-15 06:27:42 +0000 which is the same as the source!
I think I can see what the problem is here - it's this line:
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT-07:00"];
GMT-07:00 is not a valid abbreviation for this method. If you call [NSTimeZone abbreviationDictionary] you'll get a dictionary containing all available abbreviations. You need to use the actual abbreviation (eg, 'PST' for Pacific Standard Time), and not the format "GMT-07:00".
To save you time, here's the full list of supported abbreviations using NSTimeZone.
ADT = "America/Halifax";
AKDT = "America/Juneau";
AKST = "America/Juneau";
ART = "America/Argentina/Buenos_Aires";
AST = "America/Halifax";
BDT = "Asia/Dhaka";
BRST = "America/Sao_Paulo";
BRT = "America/Sao_Paulo";
BST = "Europe/London";
CAT = "Africa/Harare";
CDT = "America/Chicago";
CEST = "Europe/Paris";
CET = "Europe/Paris";
CLST = "America/Santiago";
CLT = "America/Santiago";
COT = "America/Bogota";
CST = "America/Chicago";
EAT = "Africa/Addis_Ababa";
EDT = "America/New_York";
EEST = "Europe/Istanbul";
EET = "Europe/Istanbul";
EST = "America/New_York";
GMT = GMT;
GST = "Asia/Dubai";
HKT = "Asia/Hong_Kong";
HST = "Pacific/Honolulu";
ICT = "Asia/Bangkok";
IRST = "Asia/Tehran";
IST = "Asia/Calcutta";
JST = "Asia/Tokyo";
KST = "Asia/Seoul";
MDT = "America/Denver";
MSD = "Europe/Moscow";
MSK = "Europe/Moscow";
MST = "America/Denver";
NZDT = "Pacific/Auckland";
NZST = "Pacific/Auckland";
PDT = "America/Los_Angeles";
PET = "America/Lima";
PHT = "Asia/Manila";
PKT = "Asia/Karachi";
PST = "America/Los_Angeles";
SGT = "Asia/Singapore";
UTC = UTC;
WAT = "Africa/Lagos";
WEST = "Europe/Lisbon";
WET = "Europe/Lisbon";
WIT = "Asia/Jakarta";