You will need two series. Suppose dates are in A2:A100, values to plot in
B2:B100
In C1 use =IF(A1<=TODAY(),B2,NA())
In D1 use =IF(A1>TODAY(),B2,NA())
Copy both down their columns
Quickest way is to select all data and make your chart, then delete the line
in the cart for column B (or use CTRL to select A, C and D)
Visit Jon Peltier and look at his 'conditional chart' material
http://peltiertech.com/Excel/Charts/...nalChart1.html
best wishes
--
Bernard Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
"cliffordjf" <(E-Mail Removed)> wrote in message
news

667E7EE-30DA-4CA2-AF3E-(E-Mail Removed)...
>I have a series of values associated with dates; the values in the past
>are
> fact, the values in the future are estimates. When I graph the data, the
> line is all the same color throughout the series. Is there a way to have
> the
> color of the line change as the dates become past, rather than future....
>
> in other words, the line is black through todays data, but turns to red
> from
> tomorrow on, then as tomorrows comes, that part of the line turns from red
> to
> black...
>
> thanx
>
> cjf