You may set the Label of the DateTime axis to be 'OnTicks' while designing the Graph in the Report Designer - check 'LableOnTicks.png' screenshot.
The value of the property may be changed also from the graph axis Properties pane - check 'AxisScalePositionMode.png' screenshot.
The second requirement can be achieved by controlling the Scale->BaseUnit property of the graph axis - 'AxisScaleBaseUnit.png'. If the Dates are formatted as year and month, this should be the default behavior.
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