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POdateFromString returned a wrong date after setLocale
 

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  1. POdateFromString returned a wrong date after setLocale
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    <p>I have following codes:</p> <pre class="lang-c prettyprint-override"> NSDate *today = [NSDate date]; NSDateFormatter *formatter = [[NSDateFormatter alloc]init]; NSLocale *zh_CN = [[NSLocale alloc]initWithLocaleIdentifier:@"zh_CN"]; [formatter setLocale:zh_CN]; [formatter setDateStyle:NSDateFormatterFullStyle]; [formatter setTimeStyle:NSDateFormatterNoStyle]; NSDateFormatter *newFormatter = [[NSDateFormatter alloc]init]; NSLocale *en_US = [[NSLocale alloc]initWithLocaleIdentifier:@"en_US"]; [newFormatter setLocale:en_US]; [newFormatter setDateStyle:NSDateFormatterFullStyle]; [newFormatter setTimeStyle:NSDateFormatterNoStyle]; NSLog(@"today: %@", today); NSString *todayString = [formatter stringFromDate:today]; NSLog(@"zh_CN todayString: %@", todayString); NSDate *backToDate = [formatter dateFromString:todayString]; NSLog(@"zh_CN backToDate: %@", backToDate); NSString *newTodayString = [newFormatter stringFromDate:today]; NSLog(@"en_US newTodayString: %@", newTodayString); NSDate *newBackToDate = [newFormatter dateFromString:newTodayString]; NSLog(@"en_US newBackToDate: %@", newBackToDate); </pre> <p>I was expecting backToDate = newBackToDate = today, but the log shows different:</p> <pre> 2013-02-15 00:18:12.594 TestNSDate[16637:11303] today: 2013-02-14 16:18:12 +0000 2013-02-15 00:18:12.595 TestNSDate[16637:11303] zh_CN todayString: 2013年2月15日星期五 2013-02-15 00:18:12.596 TestNSDate[16637:11303] zh_CN backToDate: 1999-12-30 16:00:00 +0000 2013-02-15 00:18:12.619 TestNSDate[16637:11303] en_US newTodayString: Friday, February 15, 2013 2013-02-15 00:18:12.620 TestNSDate[16637:11303] en_US newBackToDate: 2013-02-14 16:00:00 +0000 </pre> <p>Here we can see the backToDate was became 1999-12-30, why would this happen?</p>
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    1. USDaniel Chen
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    1. COPresumably the formatter didn't recognize the supplied date string.
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      1. USHot Licks
    2. COThat's strange. It worked properly with the `en_US` locale and the `newFormatter` but it fails to work properly with the `zh_CN` locale and `formatter`. One would expect a given date formatter to properly parse a string that it just generated. Where was this run? device or simulator? What version of iOS? Try some other versions.
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      1. POdateFromString returned a wrong date after setLocale
      1. USrmaddy
    3. COOne guesses that there are "restrictions" on the zh_CN locale formatter.
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