Allowing custom date formatting for google charts and highcharts

[alterx]

Following up with the issue #10 I raised a couple of days ago I'm submitting this pull request.

These changes allow custom date formatting for both highcharts and google charts.

[ankane]

Awesome, thanks for the pull request. I'll try it out when I get a chance.

How consistent is the format string between Google Charts and Highcharts? For instance, if I want to show "Jan 1, 2014", will dateFormat be the same for both?

[alterx]

Awesome, and about consistency sadly the formats used by Highcharts differ from the ones used by Google Charts.

Google Charts: https://developers.google.com/chart/interactive/docs/reference#dateformatter
Highcharts: http://api.highcharts.com/highcharts#xAxis.dateTimeLabelFormats

[alterx]

Hey @ankane , just making a follow up on this request, have you had the chance to give it a look?

[ankane]

Hey, sorry it's been so long - thanks for the reminder. I'll revisit it this week.

[alterx]

Awesome @ankane , did you have the chance to review it?

[ankane]

Apologies again. Putting tooltips aside for now, I simplified it down to this. Does this work for you?

master...date_format

[alterx]

It certainly works, sir.

Thank you @ankane :D

[noreaster]

Did this change end up in the master branch?
It would be nice to be able to format the dates in the tooltips. I'm using the ruby version, and it's been pretty good to me so far. Thanks for your work!

[alterx]

I think this never actually got into the master branch @noreaster

[ptdev]

👍 This should be added

[aouji]

Any chance this will get merged?

[NikAlexander]

I would like to customize the date below my horizontal axis to look like this:

"Aug, 23 24 25 26 27"

Am I able to set the month to only the first number as shown above?

[halilim]

Ping...

[thekeenant]

This one works with master #39