date field not standardize

my problem is about how to standardize format date while storing data

- > my pc set regional setting as mm/dd/yyyy
-> ms sql server just followed this format (i guess)
->date field using data type datetime


i have web page that required user insert date with format dd/mm/yyyy

after that i'll convert that value to ->mm/dd/yyyy

it seem to be okay at first . but when i try to insert this date value it will start to be suck all my day.

date value -> 05/11/2003 (that mean 05 November 2003)
suppose that data store to table -> 11/05/2003

but this is what happen to my table ->05/11/2003 . so it take 05 as month and 11 as day. but when i try insert more then 10 day it's okay 15/12/2003

sorry if my word not very clear. but i really need help on thisIf you are transferring the date as a string then use yyyymmdd - it is unambiguous (yyyy-mm-dd is not).