src/java.base/share/classes/java/time/format/DateTimeFormatterBuilder.java

*** 1477,1489 ****
       *    w       1      append special localized WeekFields element for numeric week-of-year
       *    ww      2      append special localized WeekFields element for numeric week-of-year, zero-padded
       *    W       1      append special localized WeekFields element for numeric week-of-month
       *    d       1      appendValue(ChronoField.DAY_OF_MONTH)
       *    dd      2      appendValue(ChronoField.DAY_OF_MONTH, 2)
!      *    D       1      appendValue(ChronoField.DAY_OF_YEAR)
!      *    DD      2      appendValue(ChronoField.DAY_OF_YEAR, 2)
!      *    DDD     3      appendValue(ChronoField.DAY_OF_YEAR, 3)
       *    F       1      appendValue(ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH)
       *    g..g    1..n   appendValue(JulianFields.MODIFIED_JULIAN_DAY, n, 19, SignStyle.NORMAL)
       *    E       1      appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
       *    EE      2      appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
       *    EEE     3      appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
--- 1477,1487 ----
       *    w       1      append special localized WeekFields element for numeric week-of-year
       *    ww      2      append special localized WeekFields element for numeric week-of-year, zero-padded
       *    W       1      append special localized WeekFields element for numeric week-of-month
       *    d       1      appendValue(ChronoField.DAY_OF_MONTH)
       *    dd      2      appendValue(ChronoField.DAY_OF_MONTH, 2)
!      *    D..D    1..3   appendValue(ChronoField.DAY_OF_YEAR, n, 19, SignStyle.NORMAL)
       *    F       1      appendValue(ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH)
       *    g..g    1..n   appendValue(JulianFields.MODIFIED_JULIAN_DAY, n, 19, SignStyle.NORMAL)
       *    E       1      appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
       *    EE      2      appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
       *    EEE     3      appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
*** 1829,1844 ****
                  } else {
                      throw new IllegalArgumentException("Too many pattern letters: " + cur);
                  }
                  break;
              case 'D':
!                 if (count == 1) {
!                     appendValue(field);
!                 } else if (count <= 3) {
!                     appendValue(field, count);
!                 } else {
                      throw new IllegalArgumentException("Too many pattern letters: " + cur);
                  }
                  break;
              case 'g':
                  appendValue(field, count, 19, SignStyle.NORMAL);
                  break;
--- 1827,1840 ----
                  } else {
                      throw new IllegalArgumentException("Too many pattern letters: " + cur);
                  }
                  break;
              case 'D':
!                 if (count > 3) {
                      throw new IllegalArgumentException("Too many pattern letters: " + cur);
+                 } else {
+                     appendValue(field, count, 19, SignStyle.NORMAL);
                  }
                  break;
              case 'g':
                  appendValue(field, count, 19, SignStyle.NORMAL);
                  break;