Initial implementation of Cron format parser

test/zutil/CronTimerTest.java

@@ -0,0 +1,29 @@
+package zutil;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+import static org.junit.Assert.*;
+
+/**
+ *
+ */
+public class CronTimerTest {
+
+    @Test
+    public void getRange() throws Exception {
+        // invalid numbers
+        assertEquals(Collections.EMPTY_LIST, CronTimer.getRange(""));
+        assertEquals(Collections.EMPTY_LIST, CronTimer.getRange(null));
+
+        // ranges
+        //assertEquals(Arrays.asList(0,1), CronTimer.getRange("0-1"));
+
+        // intervals
+
+        // range and interval
+    }
+
+}