Highcharts thinks all dates are 1970-01-01, despite them being valid epoch times <p>I'm working with this simple chart:</p> <p><a href="https://jsfiddle.net/w7uyghqn/2/" rel="nofollow">https://jsfiddle.net/w7uyghqn/2/</a></p> <p>My dates are in the format: <code>Date(1447793679000)</code>, which translates correctly to <code>Thu Aug 11 2016 10:26:59 GMT-0400 (EDT)</code>. </p> <pre><code>var seriesOptions = [ { "data":[ [Date(1447793679000), 7.8494623656], [Date(1450913358000), 5.4140127389], [Date(1460475392000), 6.015037594], [Date(1460648544000), 3.75], [Date(1460753244000), 2.1015761821], [Date(1460985174000), 3.0141843972], [Date(1460988174000), 5.2264808362], [Date(1461874589000), 1.5100671141] ], "name":"Product 1" }, { "data":[ [Date(1450729647000), 2.9850746269], [Date(1452184898000), 4.1666666667], [Date(1454616863000), 4.1749502982], [Date(1455206741000), 2.6717557252], [Date(1458062356000), 2.4], [Date(1459868909000), 3.8461538462], [Date(1459882015000), 3.3955857385], [Date(1459968893000), 4.1832669323], [Date(1460574864000), 4.973357016], [Date(1460665314000), 5.2032520325] ], "name":"Product 2" } ] </code></pre> <p>However, as you can see on the x-axis, this is all Jan 1st 1970. Can anyone spot what's wrong?</p> <p>I've tried so many different formats and I'm totally tearing my hair out. </p>