There are 10C4 = 10*9*8*7/(4*3*2*1) combinations of 4 digits that are all different. That is, 210 of them, and I have no inclination to list them.
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The Solitude of Prime Numbers was created on 2010-09-09.
I'll get back to you on 8-5-09.
154 is greater, unless 09 is written as '09, meaning 2009.
The date 9-9-09 in Roman numerals is IX.IX.IX. If the numbers represent the date 09-09-2009 that would be IX.IX.MMIX
If you write September 09 2009 as 09-09-2009 then you can write using these numerals IX (9) and MM = 2000, so 09-09-2009 becomes IX.IX.MMIX