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The legendText was showing NaN because the JSON you were using didn’t had valuey in the last object.

{"valuex":"2017-02-20 17:44:36"}

Also the legendText had a redundant 0 in front of it, because value (a number) was concatenated to a string deltaX.

value = value + deltaX;

You will need to initialize value as an empty string. To format the the legend text you can use CanvasJS.formatDate() with "YYYY-MM-DD hh:mm:ss:fff" valueFormatString.Please check this jsfiddle.


Suyash Singh
Team CanvasJS

  • This reply was modified 3 years, 11 months ago by Suyash Singh. Reason: indent