XY Scatter Graph - auto time scale adds extra days

Hi!

I have this XY Scatter graph with date column for X axis formatted as follows:

27/12/10 00:00
27/12/10 01:00
27/12/10 02:00
....
02/01/11 21:00
02/01/11 22:00
02/01/11 23:00

Scale is set to auto and the problem is the graph adds one extra empty day at the extremities of the X time scale. See attached screenshots.

Can this be fixed? I really need the AUTO option because the date is dynamic and I have tens of graphs generated every week. I'm also stuck with XY Scatter graph type because it is the only one that can format date/time properly. Line chart adds up all values within the same day, so that chart type is not an option.

Thanks