granularity property
The calendar unit each tile represents: one day (the default), one week, or one month. Tapping a week/month tile selects and emits the unit's start date. In week/month granularity the first tile is the unit CONTAINING startDate, so it may begin before startDate, and daysCount counts tiles (weeks/months), not days. Gregorian calendar only.
Implementation
final DateGranularity granularity;