Show date in UI DB Stats axes

Currently the x-axis of DB Stats charts do not show dates, making it difficult to interpret the range of time displayed in the chart.

For example, you can see in the date menu shown in the attached image that the chart range is over 4 days, but this is not apparent in the x-axis of each chart -- the x-axis only shows one reference time of 07:00.

It would be more helpful if the axis showed a reference date in addition to the time, and ideally a couple dates so that it is easy to understand the time range of the chart.