The ETHIOPIAN CALENDER?

Wondering in any one of you Guys know any Idea of the ETHIOPIAN CALENDER.
I have been few times, they use totally different Calender then the one we use. EG in Ethiopia it is now 2004, and in the Uk is 2011.
My question is if some is born in Ethiopia what date of birth do they use.
Any idea is well come.
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