Dojo Chart selective labels for x-axis & grid?

Your X label sets a major tick step to 10 explicitly. Judging by your labels it should be 18: 1 is 10 minutes, 6 is 1 hour, 18 is 3 hours you want. So this part is easy.

The problem is that steps are counted from 0, and 0 is 9:20am. You should start from a different number. One possible way to do it is to make 10am a zero.

It means that you should shift your data and your labels back, like that.

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