feat: support timezone on time scale charts

[freshollie]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Supports formatting time axis with specific timezone. Very likely that this PR won't be merged since we are adding a new lib @date-fns/tz however, I believe the authors should consider. Provided here incase others want to use :)

Fixed issues

• Possibility to set specific timezone for time axis #14453

Details

Before: What was the problem?

Timezone on the time scale charts were only possible to set with UTC or device local time. It wasn't possible to change this format outside the library because the axis tick intervals were lost. Doing this within the lib is very simple and the change is non breaking (unless you count the new lib as breaking)

After: How does it behave after the fixing?

Axis ticks work as expected when zooming in (even over DST changes)

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Merging options

• Please squash the commits into a single one when merging.

Other information

[echarts-bot]

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[echarts-bot]

Document changes are required in this PR. Please also make a PR to apache/echarts-doc for document changes and update the issue id in the PR description. When the doc PR is merged, the maintainers will remove the PR: awaiting doc label.

[Ovilia]

We are extremely cautious when it comes to introducing external libraries. Do you think there's a way to implement this feature without bringing in additional libraries? For instance, could we provide something like timezoneOffset (you can research how other software name similar elements).

Also, please introduce the newly added interfaces in the description of your Pull Request. Thanks!

[freshollie]

Hi @Ovilia I’m happy to document the interface changes if you believe this is something you’d want in.

Regarding the lib, @date-fns/tz is an extremely thin wrapper around the browser Intl.DateTimeFormat so in theory we could remove the lib by copying in the required source?