Does -dateWithString: really not support the
"international [standard!] string representation" of
ISO 8601?? What's the right way to convert such an
xsd:dateTime to an NSDate?
+[NSDate dateWithString:] is, I think, configured to recognize one
particular date format, which depends on your system locale. It's
not very useful. What you want to do is customize an NSDateFormatter
object to recognize your format, and then parse using it.
Here's some code I wrote recently. [...]
Thanks, I'd forgotten about NSDateFormatter. I took your code snippets
and made the following function:
NSDate* dateFromISO8601(NSString* str) {
static NSDateFormatter* sISO8601 = nil;
if (!sISO8601) {
sISO8601 = [[NSDateFormatter alloc] init];
[sISO8601 setTimeStyle:NSDateFormatterFullStyle];
[sISO8601 setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZZZ"]; // NOTE:
problem!
}
if ([str hasSuffix:@"Z"]) {
str = [[str substringToIndex:(str.length-1)]
stringByAppendingString:@"GMT"];
}
return [sISO8601 dateFromString:str];
}
This works, BUT...I had to edit the format a bit because my time
strings (in this sample!) did not have the decimal seconds. However, I
wouldn't be surprised to see input with sub-second precision. How can
I specify optional format parts?
As it is, I might as well get rid of the hasSuffix checking and put a
quoted 'Z' in the format, since that is actually far less likely to
change than the seconds part in this case. I'd hate to have to go in
search of a RegEx library or something similarly beyond the scope of
this one line (ideally) of code, just to process a date in an ISO
standard date format. Don't property lists store dates in 8601 format?
thanks,
-natevw
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