score:2

Accepted answer

You can plot them using separate x axis. (set xAxis: 0 in series 0, xAsix:1 in series 1 etc.) You can hide the extra axis. See show two different series with different start intervals with the same xAxis highcharts for some info on hiding the extra axis titles.

The alternative is to modify the x values to be all the same date. If you still want to display the date in the tooltip, you can add an extra date field to the point and use a custom tooltip to display it.

{x:Date.UTC(2013, 03, 05, 9), y:100, origdate:Date.UTC(2013, 03, 03, 9), 100},
{x:Date.UTC(2013, 03, 05, 9), y:100, origdate:Date.UTC(2013, 03, 04, 9), 100},
{x:Date.UTC(2013, 03, 05, 9), y:100, origdate:Date.UTC(2013, 03, 05, 9), 100},

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