Here is the correct format for your first clock:
[img[img][/img]]http://cruise-forums..com/countdown.php?month=05&year=2005&day=15&hour=16:00[/img[img][/img]]
From what you have I'm assuming you are sailing on May, 15 2005
Your second clock should be:
[img[img][/img]]http://cruise-forums..com/countdown.php?month=10&year=2005&day=23&hour=16:00[/img[img][/img]]
This would be October 23, 2005.
You can see that month=10 for day=23 , You should be able to tweak it from there.
You can add the ship names at the end.
Have fun on those cruises.
Mike