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Editorial Team
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Asked: 2026-06-12T11:30:18+00:00

I have some code that takes a string, turns it into a date, reformats

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I have some code that takes a string, turns it into a date, reformats it then spits it out as another string:

[formatter setDateFormat:@"YYYY'-'MM'-'DD','HH:mm:ss','ZZZ"];
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"America/New_York"]];
NSDate *date = [formatter dateFromString:combinedString];
[formatter setDateStyle:NSDateFormatterLongStyle];
NSString *finishedString = [formatter stringFromDate:date];

Basically, it works fine except for the timezones. All of the input strings are in timezone -0400, and I want the reformatted string to be in that timezone also, but the reformatted string keeps being converted forward 4 hours, even after I added the setTimeZone: line. Basically, I don’t want to change the time at all, I just want to reformat it, and I can’t understand what I am doing wrong?

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1 Answer

  1. Editorial Team

    It depends on format specified on the source of your dates. Most of the times I deal with dates in Unix/POSIX format. Then I use the following two lines of code:

    [formatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
[formatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"] autorelease]];

    Anyway, I recommend you to check the following Q&A from Apple Developers site:
    http://developer.apple.com/library/ios/#qa/qa1480/_index.html

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