These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Whether to use UTC time for axis scaling, tickmark placement and
time display in Highcharts.dateFormat. Advantages of using UTC
is that the time displays equally regardless of the user agent's
time zone settings. Local time can be used when the data is loaded
in real time or when correct Daylight Saving Time transitions are
required.
Setting useUTC to true is equivalent to setting time.timezone to
"UTC". Setting useUTC to false is equivalent to setting
time.timezone to undefined.