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INFO: Datepicking Beyond the Gregorian Calendar - Angular Blog
Datepicking Beyond the Gregorian Calendar - Angular Blog in medium.com, #BernoulliEulerOnline "...not only solve the problem for ourselves, but for others as well" (T. Schweizer).
https://blog.angular.io/datepicking-beyond-the-gregorian-calendar-7f3e76a1bdb8