ISO 8601 parsing

gistfile1.m

+ (NSDate *)dateFromISO8601String:(NSString *)iso8601 {
	if (!iso8601) {
		return nil;
	}

	const char *str = [iso8601 cStringUsingEncoding:NSUTF8StringEncoding];
	char newStr[24];

	struct tm tm;
	size_t len = strlen(str);
	if (len == 0) {
		return nil;
	}

	// UTC
	if (len == 20 && str[len - 1] == 'Z') {
		strncpy(newStr, str, len - 1);
		strncpy(newStr + len - 1, "+0000\0", 6);
	}

	// Timezone
	else if (len == 24 && str[22] == ':') {
		strncpy(newStr, str, 22);    
		strncpy(newStr + 22, str + 23, 2);
	}

	// Poorly formatted timezone
	else {
		strncpy(newStr, str, len > 24 ? 24 : len);
	}

	if (strptime(newStr, "%FT%T%z", &tm) == NULL) {
		return nil;
	}

	time_t t; 
	t = mktime(&tm);

	return [NSDate dateWithTimeIntervalSince1970:t];
}


- (NSString *)ISO8601String {
	struct tm *timeinfo;
	char buffer[80];
	
	time_t rawtime = (time_t)[self timeIntervalSince1970];
	timeinfo = gmtime(&rawtime);
	
	strftime(buffer, 80, "%Y-%m-%dT%H:%M:%SZ", timeinfo);
	
	return [NSString stringWithCString:buffer encoding:NSUTF8StringEncoding];
}

Credit where credit is due. I was messing with ISO8601DateFormatter before finding your stuff! So much simpler and better :)

Thanks :)