Hello, you can't use a function to customize your tooltips, but you could
use the PatternFormat. Here is an example: http://jsfiddle.net/cp5bY/

On Fri Jun 13 2014 at 11:40:04 PM, Duhdley d'Urite <[email protected]>
wrote:

> I'm used a stacked column chart to plot a time series which can be
> aggregated by day, week, or month.  The default tooltip shows the date and
> the value.  In the case of the *weekly* aggregation only, I want to add
> "Week of " before the date.  In the example before, I'd like the first line
> of the tooltip to read "Week of *25 Sep 2011*".  How can I do this?
>
>
> <https://lh4.googleusercontent.com/-A3KNOunEAr0/U5unA1hF4gI/AAAAAAAAAnk/TtZh3ABar0o/s1600/Camden.png>
>
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