I should be up there next week and I will have a look for you. The way the system works up there is that births are in quarters. JFM, AMJ etc.
So I will be able to find out which quarter and year they were born in. If you need to know more, one can buy the birth certificate, The cost is £6.50 about $16.50 ( I am working that you are from Oz and £1= $2.50). This will of course give you more details, but I will leave it up to you, please drop me an email at MJWebster@btinternet.com if you would like me to get the certificates.