Cocoa Looping a Dictionary

From the stanford course

NSMutableDictionary *dict = [NSMutableDictionary dictionary];

[dict setValue:[NSDate date] forKey:@"now"];

[dict setValue:[NSDate dateWithTimeIntervalSinceNow:-60] forKey:@"1 minutes ago"];

[dict setValue:[NSDate dateWithTimeIntervalSinceNow:60 * 30] forKey:@"30 minutes from now"];

[dict setValue:[NSDate dateWithTimeIntervalSinceNow:-60 * 60 * 24] forKey:@"24 hours ago"];

[dict setValue:[NSDate dateWithTimeIntervalSinceNow:-7 * 60 * 60 * 24] forKey:@"a week ago today"];

[dict setValue:[NSDate dateWithTimeIntervalSinceNow:365 * 60 * 60 * 24] forKey:@"a year from now"];

for (NSString *key in dict)

{

NSDate *date = [dict objectForKey:key];

NSLog([NSString stringWithFormat:@"Key: '%@' Date: '%@'", key, date]);

}