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It is correct because in Highcharts name of months by default starts from 0 to 11. from 0- January to 11- December.

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So for the month of may you should write 4 instead of 5.

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Date will accept the month value 0 - 11. 0 is the january and 11 is the December. So 6 referes to the June.

Check the documentation of javascript date object


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