function getstockztTime(Endt);
begin
ov:=BackupSystemParameters2();
ztC:=stockztclose(Endt);
ti:= vselect ['date'] from tradetable datekey endt to endt+0.999
of DefaultStockID() where ['sectional_high']>=ztC order by ['date'] end;
if not ifnil(ti) then return datetimetostr(ti);
else return nil;//当天没有达到涨停时返回nil
end;