Date localization formatting for Atlaskit

I’ve noticed that in some Atlaskit components where time or dates are used, they are using date-fns to handle this. A limitation of that package is handling the display of date information, respecting the JIRA Timezone setting for a user viewing the content.

Looking at the way JIRA is currently displaying dates, it appears that this kind of information is being provided from the server.

I am wondering what the expected or preferred way of handling this on the client side will be as moment.js adds a lot of weight to a bundle since it doesn’t support tree-shaking etc.