I'm doing tests to implement Highcharts in a production line. The data is sent every few seconds to a Mysql database. The problem is that when the time zone changes to adopt the summer or winter time, the date field will double for one hour. I have tried inserting manually duplicate datetimes but with different value: a double line is created but the points to see the labels only appear in one of the lines of the graph. Do you know how to fix it? Thanks