calculates when the version of Java converges with its age. Assumes Java Beta came out January 1995.

DatesApplication.java

// run with 
// java DatesApplication.java

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.Map;

public class DatesApplication {

  public static void main(String[] args) {
        var version = 19;
        var birth = LocalDate.parse("1995-01-01");
        var now = LocalDate.parse("2022-09-20");
        var yearsSince = -1L;
        while (version != yearsSince) {
            now = now.plusMonths(6);
            yearsSince = birth.until(now, ChronoUnit.MONTHS) / 12;
            version += 1;
            var s = Map.of(
                            "version", version,//
                            "years since 1.0", yearsSince,//
                            "now", now//
                    );
            System.out.println(s);
        }
    }


}