MAT_DATE_FORMATS definition/meaning of fields
Well, I figured out the following:
parse: { dateInput: 'DD.MM.YYYY', }, display: { dateInput: 'DD.MM.YYYY', monthYearLabel: 'MMM YYYY', dateA11yLabel: 'LL', monthYearA11yLabel: 'MMMM-YYYY', },with
parse.dateInput: you can let the user enter any type of date with any format, and the date adapter will reformat it to the format you specify in this attributewith
display.dateInputyou can specify the input date format (marked with 1)display.monthYearLabelyou can specify the area marked with 2
unfortunately, I still don't know about the rest!
A11Y - means accessibility. Look here https://material.angular.io/cdk/a11y/overviewand here https://material.angular.io/components/datepicker/overview#accessibility
According that I think these formats are used to display datepicker when accessibility mode on.