Kathy,
We looked into your issue and observed that the ISO-format for date-time is (YYYY-MM-DDTHH:MM:SSZ)
, which is different from what you are using.
Please take a look at the following pages for more details on JavaScript Date Formats.
JavaScript Date Format W3Schools
Date and Time Strings (JavaScript)
I have updated the fiddle please take a look.
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Indranil Deo,
Team CanvasJS