fix date parsing bug

Author: Vincent Russell

README.md

@@ -712,6 +712,12 @@ more results? (y/n): n
 
 # Change Log
 
+## [1.23](https://github.com/vincentrussell/sql-to-mongo-db-query-converter/tree/sql-to-mongo-db-query-converter-1.23) (2025-11-17)
+
+**Bugs:**
+
+- Throw an exception if dates in queries are passed in with the following invalid formats: YYYY-MM, YYYY
+
 ## [1.22](https://github.com/vincentrussell/sql-to-mongo-db-query-converter/tree/sql-to-mongo-db-query-converter-1.22) (2024-04-09)
 
 **Bugs:**

src/main/java/com/github/vincentrussell/query/mongodb/sql/converter/util/SqlUtils.java

@@ -73,6 +73,9 @@ public final class SqlUtils {
             YY_MM_DDFORMATTER,
             YYMMDDFORMATTER));
 
+    private static final Collection<Pattern> BAD_DATE_REGEXES = Collections.unmodifiableList(Arrays.asList(
+            Pattern.compile("^\\d{4}-\\d{2}$"), Pattern.compile("^\\d{4}$")));
+
     private static final Character NEGATIVE_NUMBER_SIGN = Character.valueOf('-');
 
     private SqlUtils() {
@@ -322,14 +325,19 @@ public static Object getObjectAsDate(final Object value) throws ParseException {
                     //noop
                 }
             }
+            for (Pattern pattern : BAD_DATE_REGEXES) {
+                if (pattern.matcher((String) value).matches()) {
+                     throw new ParseException("could not convert " + value + " to a valid date");
+                }
+            }
             try {
                 return parseNaturalLanguageDate((String) value);
             } catch (Exception e) {
                 //noop
             }
 
         }
-        throw new ParseException("could not convert " + value + " to a date");
+        throw new ParseException("could not convert " + value + " to a valid date");
     }
 
     /**

src/test/java/com/github/vincentrussell/query/mongodb/sql/converter/QueryConverterTest.java

@@ -389,7 +389,7 @@ private void withTimeZone(TimeZone timeZone, MyRunnable runnable) throws Excepti
     @SuppressWarnings("unchecked")
     public void selectAllFromTableWithSimpleWhereClauseLongOverrideWitUnparseableNaturalDateGT() throws ParseException {
         expectedException.expect(ParseException.class);
-        expectedException.expectMessage(containsString("could not convert who cares to a date"));
+        expectedException.expectMessage(containsString("could not convert who cares to a valid date"));
         QueryConverter queryConverter = new QueryConverter.Builder().sqlString("select * from my_table where value > \"who cares\"").fieldNameToFieldTypeMapping(new HashMap(){{
             put("value",FieldType.DATE);
         }}).build();
@@ -3100,6 +3100,17 @@ public void testAvgSelectWithHavingClause() throws ParseException, IOException {
                 "  }\n" +
                 "}])",byteArrayOutputStream.toString("UTF-8"));
     }
+    
+      @Test
+        @SuppressWarnings("unchecked")
+        public void dateFormatYYYYMM() throws ParseException {
+            expectedException.expect(ParseException.class);
+            expectedException.expectMessage(containsString("could not convert 2013-07 to a valid date"));
+            QueryConverter queryConverter = new QueryConverter.Builder().sqlString("select * from my_table where value > \"2013-07\"")
+                    .fieldNameToFieldTypeMapping(new HashMap(){{
+                put("value",FieldType.DATE);
+            }}).build();
+        }
 
     private static Document document(String key, Object... values) {
         Document document = new Document();