Can you do math with dates?

Does anyone here know how to use math to calculate the last date of any given month? I need it for something I am working on. Very odd.

So tonite I got passport photos taken. Man, do I look awful. You aren’t allowed to have any kind of smile or look on your face so I look almost pissy. Frig sakes. At least within a month I will have my own passport and this will be a very good thing.

Tamara’s mom got me some business on the dvd video thing. A friend of hers wanted to have a wedding video copied to DVD so with the help of the new DVD recorder downstairs, I can plug the camera into the inputs, and record away. I’m doing some tests now as I need to make sure that I can do a disc-to-disc copy of discs rendered on the recorder. It’ll be much faster that way if I can do a direct copy, rather than use DVDShrink to rip them like a regular movie.

It’s been damn cold out and we are VERY low on wood. We have a pile of stuff outside but its way in the back and it has not been warm enough for us to take the time to haul it in. We’re looking at buying 6 cords this year. We burned 4 cords this year and we know we’ll need more, plus its always nice to have extra. As soon as this test disc is done, I’m going downstairs to make a fire, and work on my date problem. I need to be able to know the last day of the month, regardless of which month it is, and it be accurate, using math somehow. I suspect it will all be in vain anyway but I need to figure this out. At least I am ahead of schedule on my work.