I know exactly when St Georges Day is Paul, as I do every year and, like Dolphinfairy said, it is on Monday the 23rd of April which is also the day that Shakespeare was born and also, (apparently), died on. If you want a little more try this from a website that is, obviously, not English:
"In just over a month’s time on April 23rd it’s the turn of the English to celebrate their patron saint, St George. Except they probably won’t bother, apart from a few tabloid columnists desperate to make a name for themselves having a pint of warm beer whilst draped in a flag, hoping someone will join in the ‘fun’.
There have been campaigns over recent years (such as by the Charles Wells Brewery in Bedfordshire, obviously keen to try and turn their Bombardier brand into a marketing machine like Guinness), but none have properly taken off. Why is this? Well, I reckon there are a few reasons.
* The British are notoriously rubbish at organising celebrations. Remember the string of comic Millennium Eve bungles?
* The English flag has gained an unfortunate association with football hooliganism over the years, and many people are still ashamed to display it, even though this problem has largely been stamped out.
* He picked the wrong date, really. William Shakespeare was born (and died) on April 23rd, and surely he’s far more deserving of a day in his honour?
* St George’s story is preposterous. He killed a dragon. Yes, of course he did...
* St George has nothing to do with England – he was born in the Middle East and never set foot on British shores.
* Georgey boy has to be the least fussy patron saint imaginable in terms of picking his causes. Amongst many, many others, he is the patron saint of soldiers, scouting, freemasonry, Barcelona, Genoa and syphilis sufferers. Even worse for many English people nursing the mental scars of football penalty shoot-outs – he is the patron saint of Germany.
This said, I’ll not let it be said that I’ll get in the way of a party, no matter how half-hearted it turns out to be. Mine’s a pint of warm Bombardier, please."
Source: Suite 101.
There are quite a lot of famous people born on this day too. Roy Orbison, Lee Majors, (The original Six Million Dollar Man) and the former Child star Shirley Temple Black to name but three!
Here's a list of notable events and births that took place on April 23rd from Wikipedia:
http://en.wikipedia.org/wiki/April_23 copy
Supplement from 04/21/2007 04:31pm:
This is the link for Suite 101http://internationalevents.suite101.com/blog.cfm/st_georges_day_april_23rd copy
You might also be interested in this from Woodlands Junior School. Please note that there is a very interesting comment toward the end that deserves a look but that I couldn't reproduce!
http://www.woodlands-junior.kent.sch.uk/customs/stgeorge.html copy