Chart problem

I am displaying a chart in crystal report. In this chart/graph on the vertical data axis i have values in the format like 0.00. Now I want to display this value in the format 0:00, i.e. I want to replace the period(.) with a colon.

I am not getting any solution for this. Also I have a field label on the top of the graph which is formula. In this also I have the same problem.

I can get a colon in the Time format but it is disturbing the number system of the graph.

Need a solution.I have a similar problem at the moment; my dates on the horizontal axis are in the standard DD/MM/YYYY format, whereas I need DD.MM.YYYY. I don't think Crystal Graphing tool is powerful enough to do this, but I did find that I could make it appear this way by changing my computer's regional settings.

Hope this is of some help to you.|||Yes, even I think that crystal is not capable of such a thing.
Thanks for your input anyway.