timezone dependent bugs

I don't think this has been fixed. I took the original code pen and updated it to 2.3.0:

https://codepen.io/Djeramon/pen/XWRVzwz

The behavior is not yet right. Two things are going wrong:

• For the last data point only the hover label of a single trace is shown. (Yen)
• The values for all other traces are shifted and are not shown correctly. (e.g. the third data point for US Dollar should be the value 6, but instead the hover label shows the value 8)

Originally posted by @Djeramon in https://github.com/plotly/plotly.js/issues/5822#issuecomment-886413675

首先在链接的 CodePen 中复现该行为，并将其与原始 issue #5822 进行比较。从复现结果追踪依赖时区的悬停标签和点值处理；完成的标准是最终点显示每条 trace，且每个悬停标签都显示正确的值。