Problems with styling a table column, td

I have been working on a calendar which you may think is easy to do but its not, with this calendar I am having trouble with the styling of a table column which when this is fixed the calendar will be complete





I have the calendar looking perfect in google chrome but in IE 9 the very last td that has 30 in it is all messed up for some reason and all the things I tried won't work





In all versions of firefox the very last td number 30 isn't even moving even though I have position: relative; which is very strange





you can view the page here http://troop557.vacau.com/calendar.php

Your page has numerous errors: Validate

You should at least fix the more important of these errors before you can expect it to render consistently in different browsers. Specifically, ensure that every tag has a closing tag (if required) and they are properly nested; and ensure that you are using valid attributes for your elements.

all the unrelated errors have been fixed