BarItem proptype can't accept js date object

[tlowande]

For our sort function to work properly with dates in line-chart, data needs to be JS date objects: new Date()

If we apply the above line data into a BarChart, because dates are objects, Bar gives a warning:

Invalid prop data.indexValue of type date supplied to BarItem, expected string.

however, the chart seems to compile just fine.

Didn't find much online over barChart and dates