Help with this indicator - line at candle open

Hello,
i have this open line indicator which iam using for years but there is only one problem,In the timezone tab i can only use full hours like 9:00.I cant use 9:30 so that the line is plottet at 9:30.Maybe someone can help thx.

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No sorry i want the line to be at the open of the candle like the indicator i posted.If someone could edit the indicator i poseted so i can use 9:30 or 16:30 etc,,,