tbDate:fix bug now

common/script/script-api/src/main/java/org/thingsboard/script/api/tbel/TbDate.java

@@ -218,9 +218,12 @@ public class TbDate implements Serializable, Cloneable {
         return opt;
     }
 
-    public long now() {
+    public static long now() {
         return Instant.now().toEpochMilli();
     }
+    public static String nowToString() {
+        return Instant.now().toString();
+    }
 
     public long parseSecond() {
         return instant.getEpochSecond();

common/script/script-api/src/test/java/org/thingsboard/script/api/tbel/TbDateTest.java

@@ -29,7 +29,6 @@ import org.thingsboard.common.util.JacksonUtil;
 
 import java.time.DateTimeException;
 import java.time.ZoneId;
-import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
@@ -40,6 +39,7 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 
@@ -484,6 +484,12 @@ class TbDateTest {
         Assert.assertEquals(expected, d.toLocaleString());
     }
 
+    @Test
+    public void TestNow() {
+        assertTrue(TbDate.now() > 0);
+        assertNotNull(TbDate.nowToString());
+    }
+
     @Test
     public void TestToUTC() {
         Assert.assertEquals(-2209075200000L, TbDate.UTC(0));