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When you say timestamps, are we talking about days or times? If it’s just days, you can use one x-axis like here: https://jsfiddle.net/jbmn01z6/
If you want time, then a bar chart is not a good idea. I don’t even know if it’s possible the way you would like it. I would use a line chart with a x-axis of the type: 'time'. Then you can use and show your timestamps very precisely.
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Source:stackexchange.com