JavaScript Charting Features
The chart data contains the date membership started.
The point labels use that date to calculate the duration of the membership and average usage per year.
All this is accomplished by setting the point label string as follows:
'Member <br>{years('+Date.now()+'-%since):number n1} Years <br>{%value/years('+Date.now()+'-%since):number n1} / Year'
  • TimeSpanExpressions.htmDemonstrates using token expressions to calculate time spans.
  • How to...
    • Use token expressions in labels to calculate date time spans.
      • Format label token expressions result.