Symfony 2 No route found for “GET /”

First of all ... your login url should (according to your current configuration) be /login and not /login/.

The url /login/ (with a trailing slash) does indeed not exist in your routing configuration.

The right way would be letting the router generate the url using the route's name and not hardcoding that url /login into any of your templates.

{{ path('fos_user_security_login') }}

Further ... Please read my answer here which explains the way <firewall>.login.check_path works.

Change the provider for your main firewall from user to fos_userbundle.

There is no additonal provider configuration under login_path.

firewalls:
    main:
        pattern: ^/
        provider: fos_userbundle
        form_login:
            csrf_provider:       form.csrf_provider
            login_path:          fos_user_security_login
            check_path:          fos_user_security_check
            default_target_path: app_website_index
        logout:
            path:   fos_user_security_logout
            target: fos_user_security_login
        anonymous:    true

Further you have declared logout twice in your firewall configuration (second overwrites first):

firewalls:
    # ...
    logout:       true
    # ...
    logout:
        path:   /logout
        target: /login

I've interpreted your question as how does 1025409600000 get formatted to MMDDYY as that's what's happening in the NV example.

In the example you pointed to the x axis has the dates almost in the format you want %m/%d/%Y (or MMDDYY) x axis date is formatted in the following line:

chart.xAxis
     .tickFormat(function(d) { return d3.time.format('%x')(new Date(d)) });

So the d3.time.format('%x') specifies the format of the date that is returned from (new Date(d)). The documentation you pointed at lets us know what the format will be and that is %x - date, as "%m/%d/%Y" which appears to be returning "%m/%d/%y". After reading the documentation I would have expected that the NV code would return the format you're after but you can easily get the format your after with:

d3.time.format('%m/%d/%Y')(new Date(d));

The new Date(d) takes the date data and converts it to a javascript date. The date data in the NV example is the number of milliseconds since 1 January 1970 00:00:00 UTC (Unix Epoch) -see this MDN page. You can check this your self by typing new Date(1025409600000) at the console.

To get D3 to recognise your date format whether that be %m/%d/%Y or anything else you need to create a time format and then parse your date data. This is covered in the D3 Time Formatting page you provided a link to and I'll just adapt what's there to your example.

Create the time format you need in:

var format = d3.time.format("%m/%d/%Y");

And the use that to parse your data:

format.parse(d.Date);

Without your code I can't say exactly where this needs to go but it should be pretty clear. You can also try this out at the console.

Hope this helps