I need help programming this indicator

hi every one

I need your help to program this indicator.

I need indictaor that have read the start time and end time (variable and can be controlled) and at the end of the end time it will scan the periode to find the higher closed candle and lower closed candle (not the high or low .. i need the closed value), then it will draw a line for the higher closed and lower closed with color can be controlled too.

The chart is explained my request.
I am so appreicated and thanks in advance

Best wishes

Ammar

prob easier to use a PERIOD indicator where u select a start/end time (i.e. UK session). then ull have a big colored box for your period