How to write date and number in Chinese?
"Z53120385"     is

Z五三一二零三八五


And there is a formal version in capital Chinese character:

Z伍叁壹贰零叁捌伍 (usually used as price in contract)


" 11/03/2010"   is 

2010年03月11日


Chinese dates use numbers as a custom, there is no need to force translating. Or you can also use 

2010/03/11 as Year/Month/day.


If you do need a full Chinese dates in a formal document, it should be 

"二零一零年三月十一日".


I don't know what the number means, but in general, I presume there is no need to translate other than using dates in Year/Month/day. Because Chinese used to use letters and Arabic numbers in many situations like serial number, ticket number, dates and so on.