diff --git a/src/test/java/xyz/zhouxy/plusone/commons/util/DateTimeUtilTests.java b/src/test/java/xyz/zhouxy/plusone/commons/util/DateTimeUtilTests.java
index b421f33..ef7bf7f 100644
--- a/src/test/java/xyz/zhouxy/plusone/commons/util/DateTimeUtilTests.java
+++ b/src/test/java/xyz/zhouxy/plusone/commons/util/DateTimeUtilTests.java
@@ -37,7 +37,7 @@ class DateTimeUtilTests {
 
     @Test
     void testToJodaDateTime() {
-        DateTime jodaDateTime = DateTimeUtil.toJodaDateTime(Instant.now(), ZoneId.of("null"));
+        DateTime jodaDateTime = DateTimeUtil.toJodaDateTime(Instant.now(), ZoneId.of("+08:00"));
         log.info("jodaDateTime: {}", jodaDateTime);
     }