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@saul_romero,
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 updated JSFiddle.
valuey
{"valuex":"2017-02-20 17:44:36"}
value
deltaX
value = value + deltaX;
"YYYY-MM-DD hh:mm:ss:fff"
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Suyash Singh Team CanvasJS