Crp1.SelectionFormula {xxx.日期} = '1999/10/01' and {xxx.日(編號：6411)

在Crystal Report 中要選 "1999/10/01" 到 "2000/11/03" 日期內的資料???
Crp1.SelectionFormula {xxx.日期} ＞= '1999/10/01' and {xxx.日期}＜= '2000/11/03' is error!!

Why ???????????????