how to customize the draw of x axis label?

[oldoldman]

Hi guys,
I'm plotting a time series with line chart, the shape of data is like [{date:'2000.01.01',price:100},{date:'2000.01.02',price:200}], all the dates are drawing along the x axis

it is too elaborated for me, so, I preprocessed the dates, this time it looks like this, which is what I want. But the tooltip is not, I still want it show elaborated just like in the above figure, how to archive this? many thanks!