Looking for files that have been modified recently

NSString *directoryPath = <#Get a path to a directory#>;
NSDirectoryEnumerator *directoryEnumerator = [[NSFileManager defaultManager]
enumeratorAtPath:directoryPath];
NSDate *yesterday = [NSDate dateWithTimeIntervalSinceNow:(-60*60*24)];
for (NSString *path in directoryEnumerator) {
    if ([[path pathExtension] isEqualToString:@"rtfd"]) {
        // Don't enumerate this directory.
        [directoryEnumerator skipDescendents];
} else {
        NSDictionary *attributes = [directoryEnumerator fileAttributes];
        NSDate *lastModificationDate = [attributes
objectForKey:NSFileModificationDate];
        if ([yesterday earlierDate:lastModificationDate] == yesterday) {
            NSLog(@"%@ was modified within the last 24 hours", path);
} }
}