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Determines the text that will be displayed in the header’s title.

format string, default:

'MMMM YYYY'   // like 'September 2009', for month view
'MMM D YYYY'  // like 'Sep 13 2009', for week views
'MMMM D YYYY' // like 'September 8 2009', for day views

As noted above, each view has a specific default. Get fine-tuned control with View-Specific Options. A single string alone will set the value for all views.

The default values will change based on the current locale.