Changing datagrid row colours as time goes by

I need to change several datagrid row colours as the homeworks in the dataDrigView gets closer to it's finishing date.

This is what I have

gvwProyectos.Rows(gvwProyectos.CurrentRow.Index).Cells(0).Style.BackColor = Color.

"gvwProyectos" is the name of the data grid view