Saving Dates in SQLServer

Question

I have a legacy application where the input is a date string, i.e.:

06/12/2009

The format of the input is always a string, and i

Answer 1

Keep in mind that DATA is not its PRESENTATION. In this case that DATA is a DATE or DATETIME, regardless of how you show them.
As for inserting/updating/comparing datetime values, I quote the BOL:

When specifying dates in comparisons or for input to INSERT or UPDATE statements, use constants that are interpreted the same for all language settings: ADO, OLE DB, and ODBC applications should use the ODBC timestamp, date, and time escape clauses of:
{ ts 'yyyy-mm-dd hh:mm:ss[.fff] '} such as: { ts '1998-09-24 10:02:20' }
{ d 'yyyy-mm-dd'} such as: { d '1998-09-24' }
{ t 'hh:mm:ss'} such as: { t '10:02:20'}

I can assure you that, if you use this formats they will always work, regardless of the locale of you server