In the JSFiddle that you have shared, we observe that you are not providing x-values, because of which the date starts from Jan 1 1970 – as x-values are auto-assigned as 1,2,3,… internally. As the axis is dateTime axis, we suggest you to use intervalType along with interval to set the interval but to pass x-values.
Here is the working fiddle with formatted-labels in “DD/MM/YYYY” format.
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Vishwas R
Team CanvasJS