What type of chart do you have?
XY?
Line?

Do you want it to automatically change or are you willing to do something to
the chart each day?

one way to do this which will work in many charts is to use the Y Error bar
and just have a value on todays date

"ano" wrote:

I have created a diagram generated by a spreadsheet wich I daily update with
new data. In the diagram I can see the curves updating and replaces the
previous line. (the lines are horizonal) But... I would like to have a
vertical representing todays date so I with ease can see the most actual
point. In other words: Can I create a Vertical (dynamic) line in a diagram
with horizonal curves?