Trend line object

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Hi, I want to my EA to automatically draw trend line of ray type every day from 06:00 to 20:00 Hrs. How can I do this.
A sample is given below. But i am unable to figure out what to write in ??? area which is basically the datetime

ObjectCreate("obj name",OBJ_TREND, 0, ???, WindowPriceMax() - Point * 10, ???, WindowPriceMax() - Point * 10);
ObjectSet("usdtime", OBJPROP_RAY, 0);

Regards,
Ali Nasir