in the historical gadget chart the values shown have one day offset

If today is 20 September and we choose 2 days, it shows 20 and 19th of September as labels on the chart; however, it seems that the values of bars are shown for 18th and 19th of September. Thus, the values seem to be offset by 1 day (i.e. the bar label says 20th September, but the values are the ones from the 19th)