datecheck

string _strdatePtrn = @"(^((((0[1-9])

([1-2][0-9])
(3[0-1]))
([1-9]))\x2F(((0[1-9])
(1[0-2]))
([1-9]))\x2F(([0-9]{2})
(((19)
([2]([0]{1})))([0-7]{1})([0-9]{1}))))$)";