Issue 548: TO_CHAR does not format MM and DD correctly when the month or day of…

Issue 548: TO_CHAR does not format MM and DD correctly when the month or day of the month is 1 digit, patch from "the.tucc"

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

@@ -629,7 +629,7 @@ public class ToChar {
                 output.append(cal.get(Calendar.DAY_OF_YEAR));
                 i += 3;
             } else if ((cap = containsAt(format, i, "DD")) != null) {
-                output.append(cal.get(Calendar.DAY_OF_MONTH));
+                output.append(String.format("%02d",cal.get(Calendar.DAY_OF_MONTH)));
                 i += 2;
             } else if ((cap = containsAt(format, i, "DY")) != null) {
                 String day = new SimpleDateFormat("EEE").format(ts).toUpperCase();
@@ -753,7 +753,7 @@ public class ToChar {
                 output.append(cap.apply(month));
                 i += 3;
             } else if ((cap = containsAt(format, i, "MM")) != null) {
-                output.append(cal.get(Calendar.MONTH) + 1);
+                output.append(String.format("%02d",cal.get(Calendar.MONTH) + 1));
                 i += 2;
             } else if ((cap = containsAt(format, i, "RM")) != null) {
                 int month = cal.get(Calendar.MONTH) + 1;

h2/src/test/org/h2/test/db/TestFunctions.java

@@ -1288,6 +1288,11 @@ public class TestFunctions extends TestBase implements AggregateFunction {
         assertResult("7979", stat, "SELECT TO_CHAR(X, 'yyfxyy') FROM T");
         assertThrows("", stat, "SELECT TO_CHAR(X, 'A') FROM T");
 
+        // check a bug we had when the month or day of the month is 1 digit
+        stat.executeUpdate("TRUNCATE TABLE T");
+        stat.executeUpdate("INSERT INTO T VALUES (TIMESTAMP '1985-01-01 08:12:34.560')");
+        assertResult("19850101", stat, "SELECT TO_CHAR(X, 'YYYYMMDD') FROM T");
+        
         conn.close();
     }