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    <p>Have a look at the <a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html#//apple_ref/doc/uid/TP40002369-SW1" rel="nofollow">Date Formatting Guide</a> from Apple. The section "Use Format Strings to Specify Custom Formats" lists all the different standards the are supported by various iOS versions for specifying a format string. I would say that "00" is not allowed, so that is the reason why "MM00yyyy" is failing. Similarly, "MMddyyyy" is also failing because no day can be "00".</p> <p>I don't know if you can have more luck with UNIX functions, as the Apple doc suggests:</p> <blockquote> <p>For date and times in a fixed, unlocalized format, that are always guaranteed to use the same calendar, it may sometimes be easier and more efficient to use the standard C library functions strptime_l and strftime_l.</p> <p>Be aware that the C library also has the idea of a current locale. To guarantee a fixed date format, you should pass NULL as the loc parameter of these routines. This causes them to use the POSIX locale (also known as the C locale), which is equivalent to Cocoa's en_US_POSIX locale, as illustrated in this example.</p> </blockquote> <pre><code> struct tm sometime; const char *formatString = "%Y-%m-%d %H:%M:%S %z"; (void) strptime_l("2005-07-01 12:00:00 -0700", formatString, &amp;sometime, NULL); NSLog(@"NSDate is %@", [NSDate dateWithTimeIntervalSince1970: mktime(&amp;sometime)]); // Output: NSDate is 2005-07-01 12:00:00 -0700 </code></pre>
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    1. POnil result from NSDateFormatter with 0's in format string
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    1. USsergio
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    1. COI would expect in the end for '0''0' or '00' to work, because that should just be a literal match, yet neither of those patterns work
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      1. USDan F
 

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