function main()
 local i;
 i=1;
 message("1. t="..type(i));   -- (number)
 i=1.1;
 message("2. t="..type(i));   -- (number)
 i="1";
 message("3. t="..type(i));   -- (string)
 i=i*1.1;
 message("4. t="..type(i));   -- (number)
 i="1.1";
 message("5. t="..type(i));   -- (string)
 i=i*1.1;
 message("6. t="..type(i));   -- (number)
 i=1;
 message("7. t="..math.type(i));   -- (integer)   
 i=1.1;
 message("8. t="..math.type(i));   -- (float)
 i="1";
 message("9. t="..math.type(i));   -- (attempt to concatenate a nil value)
end

if 100 * (100 * datetime.hour + datetime.min) + datetime.sec > 123000 then

os.time(getItem ("trades", i).datetime)