How can i let sql server 2008 accept the date 2003/2/29 -

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i have date 29/2/2003 when export table in database system convert null how can let sql server 2008 accept date 2003/2/29 ?

if insert date format not valid : 2003/2/29 ,you error :

string not recognised valid datetime

in order save ,change datatype nvarchar


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