How do I add a secondary X axis which is in data time format

I have a chart with 6 data streams all with the same axis . The x axis is a data number. I also have the same data with a time stamp… How do I add a secondary x axis with a scale of the corresponding time stamp?

Please give simple example data and steps to create the chart. Otherwise, it is not clear what data or type of chart the question is asking about.

I have redrawn my chart using the time stamp as the primary axis and all is well.