[ZEPPELIN-3183] Add date format support for line chart as x-axis

[prabhjyotsingh]

What is this PR for?

Add date format support for line chart as x-axis

What type of PR is it?

[Improvement]

What is the Jira issue?

• ZEPPELIN-3183

Screenshots (if appropriate)

Before

After

Questions:

• Does the licenses files need update? N/A
• Is there breaking changes for older versions? N/A
• Does this needs documentation? N/A

[zjffdu]

LGTM，one minor concern: is the millisecond displayed by default ? IMO, second should be sufficient for most of cases.

[prabhjyotsingh]

I think the number what you see after +{number} is the time zone. Eg:

Default which is coming from query -> 2018-01-22T14:57:43+0000
When enabled Date -> Mon Jan 22 2018 20:27:43 GMT+0530 (IST)

Update:
This is what different browser displayes:

Browser	Date Format
Chrome	Mon Jan 22 2018 20:27:43 GMT+0530 (IST)
Firefox	2018-01-23T03:29:59.137Z

Let me make a relevant change to make this uniform.

[prabhjyotsingh]

Thanks for the review will merge this if no more discussion.