popoverFormat
Determines the date format of title of the popover created by the moreLinkClick option.
Date Formatter, default:
{ month: 'long', day: 'numeric', year: 'numeric' }The default value produces strings like September 24, 2026. Some themes set their own format: Forma uses { day: 'numeric', weekday: 'long' } and Monarch uses { day: 'numeric', weekday: 'short' }.