Displaying another dimension in tooltip

Hi, supposed I have X days since launch in the x-axis and I wanted the actual date to show in the tooltip when user hovers over it. Is there are a way to do this? I've looked thru most links but it only shows how to display the same dimension in a different format. 

Dimension A : Days since launch
Dimension B: Date

So I want to show B when user hovers over A. How can I achieve this?

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