A live, remixable version is available at https://glitch.com/edit/#!/political-egret: the editor works fine in both Firefox 61 and Chromium, but you need Chrome/Chromium to see the live demo hosted on Glitch.
If you like this example, please share the blog post where I talk about this example on social media, and consider paying me a coffee to let me create new examples and blog posts.
The x axis is showing the time of each data point in UTC. The x axis is showing the time of each data point in the browser's timezone ([[localTimezone]])