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@greg-aharonian,
JavaScript dates may display an incorrect day when passed in ISO format (YYYY-MM-DD), depending on the user’s time zone. According to MDN, date-only formats are interpreted as UTC time, and date-time formats are interpreted as local time when the time zone offset is absent. To avoid this problem, you can use date-time format or use a different date format along with time-zone. Please take a look at this JSFiddle for an example on the same.
Also, refer to this Stack Overflow thread for more information.
—- Manoj Mohan Team CanvasJS