Fixed VALID_DATE_IO method

Author: depryf

CHANGELOG.md

@@ -3,6 +3,7 @@
 **Version 4.7**
 
 - Added new differenceInDays methods to the edits context.
+- Fixed VALID_DATE_IO metafile functions to allow trailing 0's for day and month.
 - Changed the minimum Java language for this library from Java 11 to Java 21.
 - Updated dependencies.
 

src/main/java/com/imsweb/validation/functions/MetafileContextFunctions.java

@@ -230,20 +230,24 @@ public boolean GEN_VALID_DATE_IOP(Binding binding, Object value) {
         }
 
         int month = val.trim().length() >= 6 ? Integer.parseInt(val.substring(4, 6)) : 1;
+        if (month == 0) // non-documented feature: 0 is allowed (treated as blank)
+            month = 1;
         if (month <= 0 || month > 12) {
             binding.setVariable(BINDING_KEY_DATE_COMPONENT, "invalid as to month");
             return false;
         }
 
         try {
             int day = val.trim().length() == 8 ? Integer.parseInt(val.substring(6, 8)) : 1;
+            if (day == 0) // non-documented feature: 0 is allowed (treated as blank)
+                day = 1;
             if (day <= 0 || day > 31) {
                 binding.setVariable(BINDING_KEY_DATE_COMPONENT, "invalid as to day");
                 return false;
             }
             LocalDate toCheck = LocalDate.of(year, month, day);
             int actualMaxDay = YearMonth.of(year, month).lengthOfMonth();
-            if (day <= 0 || day > actualMaxDay) {
+            if (day > actualMaxDay) {
                 binding.setVariable(BINDING_KEY_DATE_COMPONENT, "invalid as to day");
                 return false;
             }

src/test/java/com/imsweb/validation/functions/MetafileContextFunctionsTest.java

@@ -679,6 +679,14 @@ public void testGEN_VALID_DATE_IOP() {
         Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "20100230"));
         Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "20100229"));
         Assert.assertTrue(_functions.GEN_VALID_DATE_IOP(binding, "20120229"));
+        Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "201102"));
+        Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "2011"));
+        Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "20110299"));
+        Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "20119999"));
+        Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "99999999"));
+        Assert.assertTrue(_functions.GEN_VALID_DATE_IOP(binding, "20110200")); // trailing 0's for day is allowed (hidden feature, not in the documentation)
+        Assert.assertTrue(_functions.GEN_VALID_DATE_IOP(binding, "20110000")); // trailing 0's for month/day is allowed (hidden feature, not in the documentation)
+        Assert.assertFalse(_functions.GEN_VALID_DATE_IOP(binding, "00000000"));
 
         //today
         Assert.assertTrue(_functions.GEN_VALID_DATE_IOP(binding, today.format(yearMonthDayFormatter)));