Question

I have a stringdate 16-MAY-2010 23:04:44 which i need to convert to gmt time zone that is the out put required is 17-May-2010 12:03:03.

I used date formatters to convert but the result i am getting is not in the format i required.I am sending the code please let me know if i am doing correct or not

Here is the code:

NSString *timeStamp = [format stringFromDate:[NSDate date]];
NSString *output = [timeConv dateStringFromString:timeStamp];

- (NSString *)dateStringFromString:(NSString *)sourceString
{     
    NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
    [dateFormatter setDateFormat:@"dd-MMMM-yyyy HH:MM:ss"];
    NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
    [dateFormatter setTimeZone:gmt];
    NSDate *date = [dateFormatter dateFromString:sourceString];

    return [dateFormatter stringFromDate:date];
} 

The out put i am getting is the same old time without conversion. so please let me know the correct solution.

Answer 1

I know no cocoa whatsoever, but if I’m understanding your code correctly, you’re never telling the parser that your original string is not GMT, but rather GMT-1.

Based on your own code (and again, with no knowledge of cocoa), this is what I believe you need to do:

NSTimeZone *gmtminusone = [NSTimeZone timeZoneForSecondsFromGMT:-3600.0];
[dateFormatter setTimeZone:gmtminusone];
NSDate *date = [dateFormatter dateFromString:sourceString];
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
[dateFormatter setTimeZone:gmt];
return [dateFormatter stringFromDate:date];

If it doesn’t work right away, maybe it gives you the idea of what to do:

1. Parse the string with a date formatter set to GMT-1, to output a date.
2. Parse the date with a date formatter set to GMT, to output a string.