New util class and refactor test packages

src/main/java/org/leolo/nrdatad/util/TUIDDateFormat.java

@@ -0,0 +1,32 @@
+package org.leolo.nrdatad.util;
+
+import java.text.DateFormat;
+import java.text.FieldPosition;
+import java.text.ParsePosition;
+import java.util.Date;
+
+public class TUIDDateFormat extends DateFormat {
+
+    /**
+     *
+     */
+    private static final long serialVersionUID = 7274736087586430881L;
+
+    public static final String MONTH_ID = "MBTQPHSONDUE";
+    public static final String DAY_ID = "0123456789ABCDEFGHJKLMNPRSTUVWX";
+
+
+    @Override
+    public StringBuffer format(Date arg0, StringBuffer arg1, FieldPosition arg2) {
+        // TODO Auto-generated method stub
+        arg1.append(MONTH_ID.charAt(arg0.getMonth()));
+        arg1.append(DAY_ID.charAt(arg0.getDate()-1));
+        return arg1;
+    }
+
+    @Override
+    public Date parse(String arg0, ParsePosition arg1) {
+        throw new UnsupportedOperationException();
+    }
+
+}

src/test/java/org/leolo/nrdatad/util/TUIDDateFormatTest.java

@@ -0,0 +1,34 @@
+package org.leolo.nrdatad.util;
+
+import org.junit.Test;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+
+import static org.junit.Assert.*;
+
+public class TUIDDateFormatTest {
+
+    @Test
+    public void basicConvert() throws ParseException {
+        assertEquals("M0", convert("2022-01-01"));
+        assertEquals("MX", convert("2022-01-31"));
+        assertEquals("M0", convert("2023-01-01"));
+        assertEquals("MX", convert("2023-01-31"));
+
+        assertEquals("P0", convert("2022-05-01"));
+        assertEquals("PX", convert("2022-05-31"));
+        assertEquals("P0", convert("2023-05-01"));
+        assertEquals("PX", convert("2023-05-31"));
+
+        assertEquals("E0", convert("2022-12-01"));
+        assertEquals("EX", convert("2022-12-31"));
+        assertEquals("E0", convert("2023-12-01"));
+        assertEquals("EX", convert("2023-12-31"));
+
+    }
+
+    private String convert(String date) throws ParseException {
+        return new TUIDDateFormat().format(new SimpleDateFormat("yyyy-MM-dd").parse(date));
+    }
+}