Change the date format for month and year in the day view.

[RobbertV]

How can I change the format for the month and year in the day view?

I see in the code that this has been hardcoded in the dayModalFactory.

'previousViewDate': new DateObject({
            utcDateValue: previousViewDate.valueOf(),
            display: startOfMonth.format('YYYY-MMM')
          }),

Is there a possibility to make this configurable?
Or am I missing something?