Display wrong datetime (1/7) in xaxis

[boyanhtrai]

Codepen: https://codepen.io/azivkovi/pen/rgbEMj

Current date in the image: Jul'18
Expect date: 01 Jul

Other case:
Current date in the image : 06/07/2019
Expect date: 01/07/2019

[drummad]

I was about to post the same issue myself. I've reproduced it in a simple codepen here:

https://codepen.io/Drummad/pen/Oewyrb

In this instance the dates are from a series containing timestamps. It seems to potentially be a problem with the format function.