I am aggregating different values by month in my data. Afterwards, I use the aggregated data in a highchart where I encounter some problems with date time formats. However, this only occurs when I filter my data frame on the date before I aggregate - no filter no problem.
Since there’s no time interval but only one single instance of time when there’s one value, Highcharts uses the most fine grained format - in this case millisecond. If you always want day to be the most fine grained interval, use %e. %b for all formats smaller than day, too.
Your config of choice in this case would look similar to this: