diff --git a/src/sql/CMakeLists.txt b/src/sql/CMakeLists.txt
index 23a666f3aff3449a198766b8912004b402ec1c08..47ee3a836ba5096a5777f542d513f6d6bf54d915 100644
--- a/src/sql/CMakeLists.txt
+++ b/src/sql/CMakeLists.txt
@@ -307,6 +307,7 @@ ob_set_subtarget(ob_sql engine
   engine/expr/ob_expr_neg.cpp
   engine/expr/ob_expr_autoinc_nextval.cpp
   engine/expr/ob_expr_not.cpp
+  engine/expr/ob_expr_convert_tz.cpp
   engine/expr/ob_expr_not_between.cpp
   engine/expr/ob_expr_not_equal.cpp
   engine/expr/ob_expr_not_exists.cpp
diff --git a/src/sql/engine/expr/ob_expr_convert_tz.cpp b/src/sql/engine/expr/ob_expr_convert_tz.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2d5879eb884e383a12887a9a955511ad76fcb18c
--- /dev/null
+++ b/src/sql/engine/expr/ob_expr_convert_tz.cpp
@@ -0,0 +1,189 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+#include "sql/engine/expr/ob_expr_convert_tz.h"
+#include "lib/timezone/ob_time_convert.h"
+#include "lib/timezone/ob_timezone_info.h"
+#include "lib/ob_name_def.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "sql/engine/ob_exec_context.h"
+
+namespace oceanbase {
+using namespace common;
+namespace sql {
+
+ObExprConvertTZ::ObExprConvertTZ(common::ObIAllocator &alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_CONVERT_TZ, "convert_TZ", 3, NOT_ROW_DIMENSION)
+{}
+
+int ObExprConvertTZ::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr, ObExpr &expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr_cg_ctx);
+  UNUSED(raw_expr);
+  CK(3 == expr.arg_cnt_);
+  CK(OB_NOT_NULL(expr.args_) && OB_NOT_NULL(expr.args_[0]) && OB_NOT_NULL(expr.args_[1]) && OB_NOT_NULL(expr.args_[2]));
+  CK(ObDateTimeType == expr.args_[0]->datum_meta_.type_);
+  CK(ObDateTimeType == expr.datum_meta_.type_);
+  CK(ObVarcharType == expr.args_[1]->datum_meta_.type_);
+  CK(ObVarcharType == expr.args_[2]->datum_meta_.type_);
+  OX(expr.eval_func_ = ObExprConvertTZ::eval_convert_tz);
+  return ret;
+}
+
+int ObExprConvertTZ::eval_convert_tz(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
+{
+  int ret = OB_SUCCESS;
+  ObDatum *timestamp = NULL;
+  ObDatum *time_zone_s = NULL;
+  ObDatum *time_zone_d = NULL;
+  if (OB_FAIL(expr.eval_param_value(ctx, timestamp, time_zone_s, time_zone_d))) {
+    LOG_WARN("calc param value failed", K(ret));
+  } else if (OB_UNLIKELY(timestamp->is_null() || time_zone_s->is_null() || time_zone_d->is_null())) {
+    res.set_null();
+  } else {
+    int64_t timestamp_data = timestamp->get_datetime();
+    if (OB_FAIL(calc_convert_tz(
+            timestamp_data, time_zone_s->get_string(), time_zone_d->get_string(), ctx.exec_ctx_.get_my_session()))) {
+      LOG_WARN("calc convert tz zone failed", K(ret));
+    } else {
+      res.set_datetime(timestamp_data);
+    }
+  }
+  return ret;
+}
+
+int ObExprConvertTZ::calc_result_type3(ObExprResType &type, ObExprResType &input1, ObExprResType &input2,
+    ObExprResType &input3, common::ObExprTypeCtx &type_ctx) const
+{
+  UNUSED(type_ctx);
+  int ret = OB_SUCCESS;
+  const ObSQLSessionInfo *session = NULL;
+  if (OB_ISNULL(session = type_ctx.get_session())) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("session is null", K(ret));
+  } else {
+    type.set_datetime();
+    input1.set_calc_type(ObDateTimeType);
+    input2.set_calc_type(ObVarcharType);
+    input3.set_calc_type(ObVarcharType);
+    input2.set_calc_collation_type(session->get_nls_collation());
+    input3.set_calc_collation_type(session->get_nls_collation());
+  }
+  return ret;
+}
+
+int ObExprConvertTZ::calc_result3(common::ObObj &result, const common::ObObj &input1, const common::ObObj &input2,
+    const common::ObObj &input3, common::ObExprCtx &expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (OB_UNLIKELY(input1.is_null() || input2.is_null() || input3.is_null())) {
+    result.set_null();
+  } else {
+    int64_t timestamp_data = input1.get_datetime();
+    if (OB_FAIL(calc_convert_tz(timestamp_data, input2.get_string(), input3.get_string(), expr_ctx.my_session_))) {
+      LOG_WARN("convert time zone failed", K(ret));
+    } else {
+      result.set_datetime(timestamp_data);
+    }
+  }
+  return ret;
+}
+
+int ObExprConvertTZ::find_time_zone_pos(
+    const ObString &tz_name, const ObTimeZoneInfo &tz_info, ObTimeZoneInfoPos *&tz_info_pos)
+{
+  int ret = OB_SUCCESS;
+  tz_info_pos = NULL;
+  ObTZInfoMap *tz_info_map = NULL;
+  if (OB_ISNULL(tz_info_map = const_cast<ObTZInfoMap *>(tz_info.get_tz_info_map()))) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("tz_info_map is NULL", K(ret));
+  } else if (OB_FAIL(tz_info_map->get_tz_info_by_name(tz_name, tz_info_pos))) {
+    LOG_WARN("fail to get_tz_info_by_name", K(tz_name), K(ret));
+    tz_info_map->id_map_.revert(tz_info_pos);
+    tz_info_pos = NULL;
+  } else {
+    tz_info_pos->set_error_on_overlap_time(tz_info.is_error_on_overlap_time());
+    // need to test overlap time
+  }
+  return ret;
+}
+
+int ObExprConvertTZ::parse_string(
+    int64_t &timestamp_data, const ObString &tz_str, ObSQLSessionInfo *session, int32_t &offset)
+{
+  int ret = OB_SUCCESS;
+  int ret_more = 0;
+  if (OB_FAIL(ObTimeConverter::str_to_offset(
+          tz_str, offset, ret_more, false /* oracle_mode */, true /* need_check_valid */))) {
+    LOG_WARN("direct str_to_offset failed");
+    if (OB_LIKELY(OB_ERR_UNKNOWN_TIME_ZONE == ret)) {
+      const ObTimeZoneInfo *tz_info = NULL;
+      ObTimeZoneInfoPos *target_tz_pos = NULL;
+      if (OB_ISNULL(tz_info = TZ_INFO(session))) {
+        ret = OB_ERR_UNEXPECTED;
+        LOG_WARN("tz info is null", K(ret), K(session));
+      } else if (OB_FAIL(find_time_zone_pos(tz_str, *tz_info, target_tz_pos))) {
+        LOG_WARN("find time zone position failed", K(ret), K(ret_more));
+        if (OB_ERR_UNKNOWN_TIME_ZONE == ret && OB_SUCCESS != ret_more) {
+          ret = ret_more;
+        }
+      } else if (OB_FAIL(calc(timestamp_data, *target_tz_pos, offset))) {
+        LOG_WARN("calc failed", K(ret), K(timestamp_data));
+      }
+    } else {
+      LOG_WARN("str to offset failed", K(ret));
+    }
+  } else {
+    LOG_DEBUG("str to offset succeed", K(tz_str), K(offset));
+  }
+  return ret;
+}
+
+int ObExprConvertTZ::calc_convert_tz(int64_t &timestamp_data,
+    const ObString &tz_str_s,  // source time zone (input2)
+    const ObString &tz_str_d,  // destination time zone (input3)
+    ObSQLSessionInfo *session)
+{
+  int ret = OB_SUCCESS;
+  int32_t offset_s = 0;
+  int32_t offset_d = 0;
+  if (OB_FAIL(ObExprConvertTZ::parse_string(timestamp_data, tz_str_s, session, offset_s))) {
+    LOG_WARN("source time zone parse failed", K(tz_str_s));
+  } else if (OB_FAIL(ObExprConvertTZ::parse_string(timestamp_data, tz_str_d, session, offset_d))) {
+    LOG_WARN("source time zone parse failed", K(tz_str_d));
+  } else {
+    timestamp_data = timestamp_data + (static_cast<int64_t>(offset_d - offset_s)) * 1000000;
+  }
+  return ret;
+}
+
+int ObExprConvertTZ::calc(int64_t &timestamp_data, const ObTimeZoneInfoPos &tz_info_pos, int32_t &offset_sec)
+{
+  int ret = OB_SUCCESS;
+  offset_sec = 0;
+  int32_t tz_id = tz_info_pos.get_tz_id();
+  int32_t tran_type_id = 0;
+  ObString tz_abbr_str;
+  if (OB_FAIL(tz_info_pos.get_timezone_offset(
+          timestamp_data, offset_sec, tz_abbr_str, tran_type_id))) {  // the result value is in offset_sec
+    LOG_WARN("get timezone sub offset failed", K(ret));
+  } else {
+    LOG_DEBUG("at time zone base calc", K(timestamp_data), K(tz_id), K(tran_type_id));
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase
\ No newline at end of file
diff --git a/src/sql/engine/expr/ob_expr_convert_tz.h b/src/sql/engine/expr/ob_expr_convert_tz.h
new file mode 100644
index 0000000000000000000000000000000000000000..ae1338bd0d7baceada5a11583d439465f3289e7b
--- /dev/null
+++ b/src/sql/engine/expr/ob_expr_convert_tz.h
@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#ifndef OCEANBASE_SQL_OB_EXPR_CONVERT_TZ_H_
+#define OCEANBASE_SQL_OB_EXPR_CONVERT_TZ_H_
+#include "sql/engine/expr/ob_expr_operator.h"
+namespace oceanbase
+{
+namespace sql
+{
+class ObExprConvertTZ : public ObFuncExprOperator{
+public:
+  explicit ObExprConvertTZ(common::ObIAllocator &alloc);
+  virtual ~ObExprConvertTZ(){}
+  virtual int calc_result_type3(ObExprResType &type,
+                                ObExprResType &input1,
+                                ObExprResType &input2,
+                                ObExprResType &input3,
+                                common::ObExprTypeCtx &type_ctx)const;
+  virtual int calc_result3(common::ObObj &result,
+                           const common::ObObj &input1,
+                           const common::ObObj &input2,
+                           const common::ObObj &input3,
+                           common::ObExprCtx &expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
+                      ObExpr &expr) const override;
+  static int eval_convert_tz(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
+  static int find_time_zone_pos(const ObString &tz_name,
+                                        const ObTimeZoneInfo &tz_info,
+                                        ObTimeZoneInfoPos *&tz_info_pos);
+  static int calc_convert_tz(int64_t &timestamp_data, const ObString &tz_str_s,//source time zone (input2)
+                        const ObString &tz_str_d,//destination time zone (input3)
+                        ObSQLSessionInfo *session);
+  static int calc(int64_t &timestamp_data, const ObTimeZoneInfoPos &tz_info_pos, int32_t &offset_sec);
+  static int parse_string(int64_t &timestamp_data, const ObString &tz_str, ObSQLSessionInfo *session, int32_t &offset);
+                  
+private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprConvertTZ);
+
+};
+
+
+} //sql
+} //oceanbasel
+#endif //OCEANBASE_SQL_OB_EXPR_CONVERT_TZ_H_
\ No newline at end of file
diff --git a/src/sql/engine/expr/ob_expr_eval_functions.cpp b/src/sql/engine/expr/ob_expr_eval_functions.cpp
index 39fd9fd6a23be78d521e23b2cae7275eaaf3b274..74f66be4a03dafeb599428bb3a0ba9eae9a40b6b 100644
--- a/src/sql/engine/expr/ob_expr_eval_functions.cpp
+++ b/src/sql/engine/expr/ob_expr_eval_functions.cpp
@@ -181,6 +181,7 @@
 #include "ob_expr_bit_length.h"
 #include "ob_expr_to_single_byte.h"
 #include "ob_expr_to_multi_byte.h"
+#include "ob_expr_convert_tz.h"
 
 namespace oceanbase {
 using namespace common;
@@ -655,7 +656,7 @@ static ObExpr::EvalFunc g_expr_eval_functions[] = {
     NULL,                                             // ObExprDllUdf::eval_dll_udf,                                /* 398 */
     NULL,                                             // ObExprRawtonhex::calc_rawtonhex_expr,                      /* 399 */
     ObExprPi::eval_pi,                                /* 400 */
-    NULL,                                             //eval_question_mark_func,                                    /* 401 */
+    ObExprConvertTZ::eval_convert_tz,                 /* 401 */
     ObExprUtcTime::eval_utc_time,                     /* 402 */
     ObExprUtcDate::eval_utc_date,                     /* 403 */
     ObExprGetFormat::calc_get_format,                 /* 404 */
@@ -664,7 +665,8 @@ static ObExpr::EvalFunc g_expr_eval_functions[] = {
     ObExprTimeFormat::calc_time_format,               /* 407 */
     ObExprMakedate::calc_makedate,                    /* 408 */
     ObExprPeriodAdd::calc_periodadd,                  /* 409 */
-    ObExprExportSet::eval_export_set,                 /* 401 */
+    ObExprExportSet::eval_export_set,                 /* 410 */
+    ObExprConvertTZ::eval_convert_tz                  /* 411 */
 };
 
 REG_SER_FUNC_ARRAY(OB_SFA_SQL_EXPR_EVAL, g_expr_eval_functions, ARRAYSIZEOF(g_expr_eval_functions));
diff --git a/src/sql/engine/expr/ob_expr_operator_factory.cpp b/src/sql/engine/expr/ob_expr_operator_factory.cpp
index e4b1ed8632f438ef76089ece6efabdf29865c9d5..fbfa2e665edc8acd595c76d1e78860f09de372ec 100644
--- a/src/sql/engine/expr/ob_expr_operator_factory.cpp
+++ b/src/sql/engine/expr/ob_expr_operator_factory.cpp
@@ -265,6 +265,7 @@
 #include "sql/engine/expr/ob_expr_format.h"
 #include "sql/engine/expr/ob_expr_quarter.h"
 #include "sql/engine/expr/ob_expr_bit_length.h"
+#include "sql/engine/expr/ob_expr_convert_tz.h"
 
 using namespace oceanbase::common;
 namespace oceanbase {
@@ -556,6 +557,7 @@ void ObExprOperatorFactory::register_expr_operators()
   REG_OP(ObExprCharset);
   REG_OP(ObExprCollation);
   REG_OP(ObExprCoercibility);
+  REG_OP(ObExprConvertTZ);
   REG_OP(ObExprSetCollation);
   REG_OP(ObExprReverse);
   REG_OP(ObExprRight);
diff --git a/src/sql/parser/ob_item_type.h b/src/sql/parser/ob_item_type.h
index bf68f8b9be3d2fadd46c3b2dc96af0c51631d483..af27fcf2643195ff098f2806cfb7fdb7ee2bb724 100644
--- a/src/sql/parser/ob_item_type.h
+++ b/src/sql/parser/ob_item_type.h
@@ -580,7 +580,7 @@ typedef enum ObItemType {
   T_FUN_SYS_UTC_DATE = 1594,
   T_FUN_SYS_TIME_FORMAT = 1595,
   ///< @note add new oracle only function type before this line
-
+  T_FUN_SYS_CONVERT_TZ = 1596,
   T_FUN_SYS_END = 2000,
 
   T_MAX_OP = 3000,
diff --git a/src/sql/parser/type_name.c b/src/sql/parser/type_name.c
index a3c5b5e49bb20aca5992b3bfe1ea4e55bd32954c..218e47302ff33ef876d1ad5c5854506e428271b3 100644
--- a/src/sql/parser/type_name.c
+++ b/src/sql/parser/type_name.c
@@ -320,6 +320,7 @@ const char* get_type_name(int type)
 	case T_FUN_SYS_TIME_TO_SEC : return "T_FUN_SYS_TIME_TO_SEC";
 	case T_FUN_SYS_SEC_TO_TIME : return "T_FUN_SYS_SEC_TO_TIME";
 	case T_FUN_SYS_INTERVAL : return "T_FUN_SYS_INTERVAL";
+	case T_FUN_SYS_CONVERT_TZ : return "T_FUN_SYS_CONVERT_TZ";
 	case T_FUN_UDF : return "T_FUN_UDF";
 	case T_FUN_SYS_SUBTIME : return "T_FUN_SYS_SUBTIME";
 	case T_FUN_SYS_SQRT : return "T_FUN_SYS_SQRT";
diff --git a/test/mysql_test/test_suite/expr/r/mysql/expr_convert_tz.result b/test/mysql_test/test_suite/expr/r/mysql/expr_convert_tz.result
new file mode 100644
index 0000000000000000000000000000000000000000..db5dfef96596eb60d45ff58800d3be72385e8dc2
--- /dev/null
+++ b/test/mysql_test/test_suite/expr/r/mysql/expr_convert_tz.result
@@ -0,0 +1,361 @@
+================ expression convert_tz ================
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+00:00','+08:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:00:00','+00:00','+08:00') |
++-----------------------------------------------------+
+| 2021-01-01 20:00:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:00','+08:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:00:00','+01:00','+08:00') |
++-----------------------------------------------------+
+| 2021-01-01 19:00:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:00','+06:30');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:00:00','+01:00','+06:30') |
++-----------------------------------------------------+
+| 2021-01-01 17:30:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:00','+10:10');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:00:00','+01:00','+10:10') |
++-----------------------------------------------------+
+| 2021-01-01 21:10:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:30','+13:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:00:00','+01:30','+13:00') |
++-----------------------------------------------------+
+| 2021-01-01 23:30:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 12:00:00','-11:30','+13:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:00:00','-11:30','+13:00') |
++-----------------------------------------------------+
+| 2021-01-02 12:30:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 12:00:00','-12:00','+13:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:00:00','-12:00','+13:00') |
++-----------------------------------------------------+
+| 2021-01-02 13:00:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 00:00:00','-12:00','+13:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 00:00:00','-12:00','+13:00') |
++-----------------------------------------------------+
+| 2021-01-02 01:00:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 23:59:59','-12:00','+13:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 23:59:59','-12:00','+13:00') |
++-----------------------------------------------------+
+| 2021-01-03 00:59:59                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 13:19:38','-10:38','+10:12');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 13:19:38','-10:38','+10:12') |
++-----------------------------------------------------+
+| 2021-01-02 10:09:38                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 12:23:35','-09:23','-11:11');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 12:23:35','-09:23','-11:11') |
++-----------------------------------------------------+
+| 2021-01-01 10:35:35                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 00:01:00','+10:00','-11:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 00:01:00','+10:00','-11:00') |
++-----------------------------------------------------+
+| 2020-12-31 03:01:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 00:11:00','+00:00','-11:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 00:11:00','+00:00','-11:00') |
++-----------------------------------------------------+
+| 2020-12-31 13:11:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-03-01 00:11:00','+00:00','-11:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-03-01 00:11:00','+00:00','-11:00') |
++-----------------------------------------------------+
+| 2021-02-28 13:11:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-06-01 00:11:00','+00:00','-11:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-06-01 00:11:00','+00:00','-11:00') |
++-----------------------------------------------------+
+| 2021-05-31 13:11:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2020-03-01 00:11:00','+00:00','-11:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2020-03-01 00:11:00','+00:00','-11:00') |
++-----------------------------------------------------+
+| 2020-02-29 13:11:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2020-02-28 23:11:00','-00:00','+11:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2020-02-28 23:11:00','-00:00','+11:00') |
++-----------------------------------------------------+
+| 2020-02-29 10:11:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2020-12-31 23:11:00','-05:00','+11:00');
++-----------------------------------------------------+
+| CONVERT_TZ('2020-12-31 23:11:00','-05:00','+11:00') |
++-----------------------------------------------------+
+| 2021-01-01 15:11:00                                 |
++-----------------------------------------------------+
+
+
+
+SELECT CONVERT_TZ('2020-12-31 23:11:00',null,'+11:00');
++-------------------------------------------------+
+| CONVERT_TZ('2020-12-31 23:11:00',null,'+11:00') |
++-------------------------------------------------+
+| NULL                                            |
++-------------------------------------------------+
+
+SELECT CONVERT_TZ('2020-12-31 23:11:00','+11:00', null);
++--------------------------------------------------+
+| CONVERT_TZ('2020-12-31 23:11:00','+11:00', null) |
++--------------------------------------------------+
+| NULL                                             |
++--------------------------------------------------+
+
+SELECT CONVERT_TZ(null,'-13:00','+11:00');
++------------------------------------+
+| CONVERT_TZ(null,'-13:00','+11:00') |
++------------------------------------+
+| NULL                               |
++------------------------------------+
+
+SELECT CONVERT_TZ(null, null,'+11:00');
++---------------------------------+
+| CONVERT_TZ(null, null,'+11:00') |
++---------------------------------+
+| NULL                            |
++---------------------------------+
+
+SELECT CONVERT_TZ(null, null, null);
++------------------------------+
+| CONVERT_TZ(null, null, null) |
++------------------------------+
+| NULL                         |
++------------------------------+
+
+SELECT CONVERT_TZ('2020-12-31 23:11:00','America/Merida','Asia/Tokyo');
++-----------------------------------------------------------------+
+| CONVERT_TZ('2020-12-31 23:11:00','America/Merida','Asia/Tokyo') |
++-----------------------------------------------------------------+
+| 2021-01-01 14:11:00                                             |
++-----------------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 00:11:00','America/Merida','Australia/Darwin');
++-----------------------------------------------------------------------+
+| CONVERT_TZ('2021-01-01 00:11:00','America/Merida','Australia/Darwin') |
++-----------------------------------------------------------------------+
+| 2021-01-01 15:41:00                                                   |
++-----------------------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 00:11:00','America/Merida','Europe/Amsterdam');
++-----------------------------------------------------------------------+
+| CONVERT_TZ('2021-01-01 00:11:00','America/Merida','Europe/Amsterdam') |
++-----------------------------------------------------------------------+
+| 2021-01-01 07:11:00                                                   |
++-----------------------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','Europe/Amsterdam','America/Merida');
++-----------------------------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','Europe/Amsterdam','America/Merida') |
++-----------------------------------------------------------------------+
+| 2021-01-01 00:11:00                                                   |
++-----------------------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','Europe/Amsterdam','Libya');
++--------------------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','Europe/Amsterdam','Libya') |
++--------------------------------------------------------------+
+| 2021-01-01 08:11:00                                          |
++--------------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','MET','Libya');
++-------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','MET','Libya') |
++-------------------------------------------------+
+| 2021-01-01 08:11:00                             |
++-------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','MET','MST');
++-----------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','MET','MST') |
++-----------------------------------------------+
+| 2020-12-31 23:11:00                           |
++-----------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','PRC','MST');
++-----------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','PRC','MST') |
++-----------------------------------------------+
+| 2020-12-31 16:11:00                           |
++-----------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','PRC','ROC');
++-----------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','PRC','ROC') |
++-----------------------------------------------+
+| 2021-01-01 07:11:00                           |
++-----------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','UCT','ROC');
++-----------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','UCT','ROC') |
++-----------------------------------------------+
+| 2021-01-01 15:11:00                           |
++-----------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','Universal','ROC');
++-----------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','Universal','ROC') |
++-----------------------------------------------------+
+| 2021-01-01 15:11:00                                 |
++-----------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00','Pacific/Marquesas','ROC');
++-------------------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00','Pacific/Marquesas','ROC') |
++-------------------------------------------------------------+
+| 2021-01-02 00:41:00                                         |
++-------------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00','GMT+0','ROC');
++-------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00','GMT+0','ROC') |
++-------------------------------------------------+
+| 2021-03-01 01:11:00                             |
++-------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00','GMT+0','Singapore');
++-------------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00','GMT+0','Singapore') |
++-------------------------------------------------------+
+| 2021-03-01 01:11:00                                   |
++-------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00','US/Michigan','ROC');
++-------------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00','US/Michigan','ROC') |
++-------------------------------------------------------+
+| 2021-03-01 06:11:00                                   |
++-------------------------------------------------------+
+
+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00', null,'ROC');
++-----------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00', null,'ROC') |
++-----------------------------------------------+
+| NULL                                          |
++-----------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00','US/Michigan', null);
++-------------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00','US/Michigan', null) |
++-------------------------------------------------------+
+| NULL                                                  |
++-------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00', null, null);
++-----------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00', null, null) |
++-----------------------------------------------+
+| NULL                                          |
++-----------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00', '+00:00','ROC');
++---------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00', '+00:00','ROC') |
++---------------------------------------------------+
+| 2021-03-01 01:11:00                               |
++---------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00', '+00:00','US/Michigan');
++-----------------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00', '+00:00','US/Michigan') |
++-----------------------------------------------------------+
+| 2021-02-28 12:11:00                                       |
++-----------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00', 'ROC','+00:00');
++---------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00', 'ROC','+00:00') |
++---------------------------------------------------+
+| 2021-02-28 09:11:00                               |
++---------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00','US/Michigan', '+00:00');
++-----------------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00','US/Michigan', '+00:00') |
++-----------------------------------------------------------+
+| 2021-02-28 22:11:00                                       |
++-----------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-02-28 17:11:00', 'ROC','+12:58');
++---------------------------------------------------+
+| CONVERT_TZ('2021-02-28 17:11:00', 'ROC','+12:58') |
++---------------------------------------------------+
+| 2021-02-28 22:09:00                               |
++---------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '-12:58','UCT');
++---------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00', '-12:58','UCT') |
++---------------------------------------------------+
+| 2021-01-01 20:09:00                               |
++---------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '-12:58','US/Michigan');
++-----------------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00', '-12:58','US/Michigan') |
++-----------------------------------------------------------+
+| 2021-01-01 15:09:00                                       |
++-----------------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '+05:12','MET');
++---------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00', '+05:12','MET') |
++---------------------------------------------------+
+| 2021-01-01 02:59:00                               |
++---------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '+03:32','PRC');
++---------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00', '+03:32','PRC') |
++---------------------------------------------------+
+| 2021-01-01 11:39:00                               |
++---------------------------------------------------+
+
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '+11:32','PRC');
++---------------------------------------------------+
+| CONVERT_TZ('2021-01-01 07:11:00', '+11:32','PRC') |
++---------------------------------------------------+
+| 2021-01-01 03:39:00                               |
++---------------------------------------------------+
\ No newline at end of file
diff --git a/test/mysql_test/test_suite/expr/t/expr_convert_tz.test b/test/mysql_test/test_suite/expr/t/expr_convert_tz.test
new file mode 100644
index 0000000000000000000000000000000000000000..97b6190d7d50ed60ed260dda9578a7809620d2d1
--- /dev/null
+++ b/test/mysql_test/test_suite/expr/t/expr_convert_tz.test
@@ -0,0 +1,66 @@
+--disable_query_log
+set @@session.explicit_defaults_for_timestamp=off;
+--enable_query_log
+--enable_abort_on_error
+--echo ================ expression convert_tz ================
+
+# 直接时刻类型
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+00:00','+08:00');
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:00','+08:00');
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:00','+06:30');
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:00','+10:10');
+SELECT CONVERT_TZ('2021-01-01 12:00:00','+01:30','+13:00');
+SELECT CONVERT_TZ('2021-01-01 12:00:00','-11:30','+13:00');
+SELECT CONVERT_TZ('2021-01-01 12:00:00','-12:00','+13:00');
+SELECT CONVERT_TZ('2021-01-01 00:00:00','-12:00','+13:00');
+SELECT CONVERT_TZ('2021-01-01 23:59:59','-12:00','+13:00');
+SELECT CONVERT_TZ('2021-01-01 13:19:38','-10:38','+10:12');
+SELECT CONVERT_TZ('2021-01-01 12:23:35','-09:23','-11:11');
+SELECT CONVERT_TZ('2021-01-01 00:01:00','+10:00','-11:00');
+SELECT CONVERT_TZ('2021-01-01 00:11:00','+00:00','-11:00');
+SELECT CONVERT_TZ('2021-03-01 00:11:00','+00:00','-11:00');
+SELECT CONVERT_TZ('2021-06-01 00:11:00','+00:00','-11:00');
+SELECT CONVERT_TZ('2020-03-01 00:11:00','+00:00','-11:00');
+SELECT CONVERT_TZ('2020-02-28 23:11:00','-00:00','+11:00');
+SELECT CONVERT_TZ('2020-12-31 23:11:00','-05:00','+11:00');
+
+#直接时刻类型异常
+SELECT CONVERT_TZ('2020-12-31 23:11:00',null,'+11:00');
+SELECT CONVERT_TZ('2020-12-31 23:11:00','+11:00', null);
+SELECT CONVERT_TZ(null,'-13:00','+11:00');
+SELECT CONVERT_TZ(null, null,'+11:00');
+SELECT CONVERT_TZ(null, null, null);
+
+#时区类型
+SELECT CONVERT_TZ('2020-12-31 23:11:00','America/Merida','Asia/Tokyo');
+SELECT CONVERT_TZ('2021-01-01 00:11:00','America/Merida','Australia/Darwin');
+SELECT CONVERT_TZ('2021-01-01 00:11:00','America/Merida','Europe/Amsterdam');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','Europe/Amsterdam','America/Merida');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','MET','Libya');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','MET','MST');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','PRC','MST');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','PRC','ROC');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','UCT','ROC');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','Universal','ROC');
+SELECT CONVERT_TZ('2021-01-01 07:11:00','Pacific/Marquesas','ROC');
+SELECT CONVERT_TZ('2021-02-28 17:11:00','GMT+0','ROC');
+SELECT CONVERT_TZ('2021-02-28 17:11:00','GMT+0','Singapore');
+SELECT CONVERT_TZ('2021-02-28 17:11:00','US/Michigan','ROC');
+
+#时区类型异常
+SELECT CONVERT_TZ('2021-02-28 17:11:00', null,'ROC');
+SELECT CONVERT_TZ('2021-02-28 17:11:00','US/Michigan', null);
+SELECT CONVERT_TZ('2021-02-28 17:11:00', null, null);
+
+#混合类型
+SELECT CONVERT_TZ('2021-02-28 17:11:00', '+00:00','ROC');
+SELECT CONVERT_TZ('2021-02-28 17:11:00', '+00:00','US/Michigan');
+SELECT CONVERT_TZ('2021-02-28 17:11:00', 'ROC','+00:00');
+SELECT CONVERT_TZ('2021-02-28 17:11:00', 'US/Michigan', '+00:00');
+SELECT CONVERT_TZ('2021-02-28 17:11:00', 'ROC','+12:58');
+SELECT CONVERT_TZ('2021-01-01 07:11:00', 'UCT','-12:58');
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '-12:58','UCT');
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '-12:58','US/Michigan');
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '+05:12','MET');
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '+03:32','PRC');
+SELECT CONVERT_TZ('2021-01-01 07:11:00', '+11:32','PRC');
\ No newline at end of file