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RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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Get the latest version of RGraph (version 6.17) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£99) commercial license available.

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RGraph 5.25 to include Moment.js

Written by Richard Heyes, RGraph author, on 22nd July 2020

From version 5.25 RGraph will bundle the Moment.js library with it. This library gives you far greater control over dates and times than the RGraph library provides. It can be used like this: 

new RGraph.Scatter({
    id: 'cvs',
    data: data,
    options: {
        tickmarksSize: 10,
        xaxisTickmarksCount: 7,
        xaxisScaleMin: moment('2020-01-01'),
        xaxisScaleMax: moment('2020-01-01').add(1, 'year'),
        backgroundGridVlines: false,
        marginRight: 100
    }
}).draw();

There are many more possibilities than this of course - some complicated and some not. You can read about moment.js and its documentation at the website: https://momentjs.com