The RadHtmlChart supports different baseUnits for its date x-axis, so you can try to set a lower base unit(e.g., BaseUnit="minutes"). More information on the matter is available in the Date Axis
help article and this
As for setting min and max values for the x-axis:
- For a category series like line, bar, column, etc. you can use the MinDateValue and MaxDateValue properties.
help article and then set it to the MinValue and MaxValue properties.
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