NSDate - GMT on iPhone

Question

I have the following code in a production application that calculates GMT date from user input date:

NSDate *localDate = pickedDate;
    NSTimeInterval timeZoneOffset = [[NSTimeZone defaultTimeZone] secondsFromGMT]; // You could also use the systemTimeZone method
    NSTimeInterval gmtTimeInterval = [localDate timeIntervalSinceReferenceDate] - timeZoneOffset;
    NSDate *gmtDate = [NSDate dateWithTimeIntervalSinceReferenceDate:gmtTimeInterval];

The code worked fine until a scary daylight saving time sucked in the UK last week.

How can I convert a date to GMT based on daylight saving time?

Answer 1

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NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // e.g., set for mysql date strings
[formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
NSString* mysqlGMTString = [formatter stringFromDate:[NSDate date]];

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