Describe the bug
When viewing the article or editorial stats page, the date range shows in the format YYYY-MM-DD. This should show the date range in the format selected by the journal.

To Reproduce
Steps to reproduce the behavior:

1. Go to Settings > Website > Setup > Date/Time
2. Select a date format other than YYYY-MM-DD
3. Go to Stastics > Articles
4. See the date range displayed in YYYY-MM-DD
5. Change the date range.
6. See the date range displayed in YYYY-MM-DD.

What application are you using?
3.3, main

Additional information
Reported in the forum.

There's already some code written to use moment.js to change a YYYY-MM-DD into the format selected by the journal. See the DateTimeForm. This needs to be turned into a Vue.js mixin or some other global function so that it can be used in more than one place.

When making this change, the input format for selecting a custom date range must remain YYYY-MM-DD. That's what the server expects and it won't be able to recognize a date in another format.