If your table is taking getdate() as a value to populate the table this should not be an issue, if it is using GetDate() to query the table then obviously this will be an issue.
Assuming the table has been populated with getdate() then your server side method for handling the AJAX request would be something like
Select <column> from <table> where <date column> = <date passed by ajax>
To return the correct column(s) - you will then use these columns to formulate your AJAX response.