This is great. I love it. It's very easy to do and you can learn any date of the year with simple mnemonics.
First, sorry my bad english. I've to say, this is really good packet trick. Only five cards used and this is really stunning. Also this is really easy to learn, so I highly recommend this to everyone. Resets easily when casually showing the cards and when you put the packet away. Aaro Sorva