Accepted answer

This tutorial does much of what you're asking how to do:

It builds a path-based line graph made up of dates and values.

In your case, you'll need to do some work to convert the string date ranges into real Dates that you can use to plot.

Also, just a note, if the time ranges are consecutive (i.e. each starts when the last ended), you don't need to care about the end dates.

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