Reject non-standard DATE 'yymmdd' (with 2-digit year) for now

h2/src/main/org/h2/util/DateTimeUtils.java

@@ -364,7 +364,8 @@ public class DateTimeUtils {
             // Additional [+|-]yyyyMMdd format for compatibility
             mEnd = dStart = end - 2;
             yEnd = mStart = mEnd - 2;
-            if (yEnd <= start) {
+            // Accept only 3 or more digits in year for now
+            if (yEnd < start + 3) {
                 throw new IllegalArgumentException(s);
             }
         }

h2/src/test/org/h2/test/scripts/datatypes/date.sql

@@ -24,3 +24,10 @@ SELECT DATE '20000102';
 
 SELECT DATE '-1000102';
 >> -100-01-02
+
+SELECT DATE '3001231';
+>> 0300-12-31
+
+-- PostgreSQL returns 2020-12-31
+SELECT DATE '201231';
+> exception INVALID_DATETIME_CONSTANT_2