diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java
index 21bf8e7a932b0515d77c8f124eae2d0a4596b3b6..c4785127fdbfaad3b67c2aa513bc874d7dd3fd9a 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java
@@ -57,10 +57,8 @@ public abstract class AbstractDriver implements Driver {
     }
 
     protected void loadTaosConfig(Properties info) {
-        if ((info.getProperty(TSDBDriver.PROPERTY_KEY_HOST) == null ||
-                info.getProperty(TSDBDriver.PROPERTY_KEY_HOST).isEmpty()) && (
-                info.getProperty(TSDBDriver.PROPERTY_KEY_PORT) == null ||
-                        info.getProperty(TSDBDriver.PROPERTY_KEY_PORT).isEmpty())) {
+        if ((info.getProperty(TSDBDriver.PROPERTY_KEY_HOST) == null || info.getProperty(TSDBDriver.PROPERTY_KEY_HOST).isEmpty()) && (
+                info.getProperty(TSDBDriver.PROPERTY_KEY_PORT) == null || info.getProperty(TSDBDriver.PROPERTY_KEY_PORT).isEmpty())) {
             File cfgDir = loadConfigDir(info.getProperty(TSDBDriver.PROPERTY_KEY_CONFIG_DIR));
             File cfgFile = cfgDir.listFiles((dir, name) -> TAOS_CFG_FILENAME.equalsIgnoreCase(name))[0];
             List<String> endpoints = loadConfigEndpoints(cfgFile);
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/DatetimeBefore1970Test.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/DatetimeBefore1970Test.java
new file mode 100644
index 0000000000000000000000000000000000000000..fb69b36f59522675e53305ab6ff4cb4393f46198
--- /dev/null
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/DatetimeBefore1970Test.java
@@ -0,0 +1,68 @@
+package com.taosdata.jdbc.cases;
+
+import com.taosdata.jdbc.utils.TimestampUtil;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.sql.*;
+
+public class DatetimeBefore1970Test {
+
+    private static Connection conn;
+
+    @Test
+    public void test() {
+        try (Statement stmt = conn.createStatement()) {
+            stmt.executeUpdate("insert into weather values('1969-12-31 23:59:59.999')");
+            stmt.executeUpdate("insert into weather values('1970-01-01 00:00:00.000')");
+            stmt.executeUpdate("insert into weather values('1970-01-01 08:00:00.000')");
+            stmt.executeUpdate("insert into weather values('1970-01-01 07:59:59.999')");
+
+            ResultSet rs = stmt.executeQuery("select * from weather");
+            while (rs.next()) {
+                Timestamp ts = rs.getTimestamp("ts");
+                System.out.println("long: " + ts.getTime() + ", string: " + TimestampUtil.longToDatetime(ts.getTime()));
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void main(String[] args) {
+        System.out.println("timestamp: " + Long.MAX_VALUE + ", string: " + TimestampUtil.longToDatetime(Long.MAX_VALUE));
+        System.out.println("timestamp: " + Long.MIN_VALUE + ", string: " + TimestampUtil.longToDatetime(Long.MIN_VALUE));
+        System.out.println("timestamp: " + 0 + ", string: " + TimestampUtil.longToDatetime(0));
+        System.out.println("timestamp: " + -1 + ", string: " + TimestampUtil.longToDatetime(-1));
+        String datetime = "1970-01-01 00:00:00.000";
+        System.out.println("timestamp: " + TimestampUtil.datetimeToLong(datetime) + ", string: " + datetime);
+        datetime = "1969-12-31 23:59:59.999";
+        System.out.println("timestamp: " + TimestampUtil.datetimeToLong(datetime) + ", string: " + datetime);
+    }
+
+    @BeforeClass
+    public void beforeClass() {
+        try {
+            Class.forName("com.taosdata.jdbc.TSDBDriver");
+            conn = DriverManager.getConnection("jdbc:TAOS://127.0.0.1:6030/?user=root&password=taosdata");
+            Statement stmt = conn.createStatement();
+            stmt.execute("drop database if exists test_timestamp");
+            stmt.execute("create database if not exists test_timestamp keep 36500");
+            stmt.execute("use test_timestamp");
+            stmt.execute("create table weather(ts timestamp)");
+            stmt.close();
+        } catch (ClassNotFoundException | SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @AfterClass
+    public void afterClass() {
+        try {
+            if (conn != null)
+                conn.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/TimeStampUtil.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/TimestampUtil.java
similarity index 98%
rename from src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/TimeStampUtil.java
rename to src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/TimestampUtil.java
index 1c6af7e3d2f1fd36fa620ab4a4dec77636d92db4..16f8269d246f094558bbe7f6b11ac4bd90eb888f 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/TimeStampUtil.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/TimestampUtil.java
@@ -4,7 +4,7 @@ import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 
-public class TimeStampUtil {
+public class TimestampUtil {
 
     private static final String datetimeFormat = "yyyy-MM-dd HH:mm:ss.SSS";