var
d:tdateTime;
str:string;
begin
d := now+30;
str := 'select * from 表名 where 时间字段<=:ddate'
with query1 do
begin
close;
sql.text := str;
参数初始值
open;
end;
end;
var
d:tdate;
str:string;
begin
d := now+30;
str := 'select * from 表名 where 时间字段<=:ddate'
with query1 do
begin
close;
sql.text := str;
参数初始值
open;
end;
end
这样就行了