See https://docs.telerik.com/blazor-ui/components/dateinput/supported-formats#two-digit-year-formats

I am using a 4-digit format as workaround, but 2-digit formats are quite normal over here. That is why most tools and OS-es have cutoff years. Often a floating cutoff year that is 50 years before the current date. So anything below 70 would be 20xx. Or you can have a cutoff year close to a century ago, because you consider dates past more relevant than future dates. 

.NET has System.Globalization.TwoDigitYearMax.